Project: road-legal NA turbo track weapon!
05-13-2020, 07:31 AM
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Join Date: Nov 2016
Location: Essen, Germany
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Project: road-legal NA turbo track weapon!
Hello dear fellow maniacs,
I'm Peter from Essen, Germany, registered here quite a while ago and have been reading through various threads on and off. I've already owned a naturally aspirated 1.8 1994 NA for the past 4 years which is restored/resprayed in mariner blue (first two pics below). I always wanted to turbocharge my car but wanted to go all in when I do it. Hence I never found the time or money to actually do it.
Originally, the plan was to turbocharge the blue NA, but as the car is basically finished as it is rn, I decided to keep the N/A NA as a reliable and somewhat usable/comfortable vehicle (not what my passengers usually say, lol) and build a completely new car from the ground up.
Long story short, the goal is to build a turbocharged, road legal (very worth mentioning as I'm located in Germany) no compromise, track-focused 1.8l NA. Plans/goals are as follows:
DRIVETRAIN:
- 450bhp -> ~380whp? on pump gas, built engine: non-VVT, machined head, +1mm Supertech valves, Supertech valve springs, aggressive cams, K1 rods, Supertech 84mm 8.6:1 pistons, ACL bearings, ARP studs, boundary stage 2 oil pump, cooling reroute, 1000cc injectors (maybe paired with DW200 fuel pump, have to look up if necessary), sturdy engine mounts, no torsional damper -> no A/C or power steering.
- Currently undecided on which turbo to use: I like the modern technology and efficiency of EFRs (e.g. 7163), have heard a lot of good things about the new G25-550/660 but also like the character that comes with the spoolup and subsequent "punch" of the oldschool GT 3071/3076. Happy about input on that matter. Aiming for a high a/r, not too concerned with ultra-early spoolup in a track use context.
- Cooling: Reroute, proper heatshielding, Mishimoto radiator, Mishimoto fan shroud kit, any good intercooler, Oil cooler, hood vents (e.g. Singular Motorsport) or a hood with vents (I like the AD9 Carbonmiata hood but that's hard to get around here), and some airflow management.
- MS3
- Kraken cast manifold
- OEM 6 speed with straight cut gears (Quaife or similar) which will hopefully help with handling the torque. Plus the sound is awesome. Racecar streetcred etc.
- ACT 6-pad clutch (sprung, rated for 550Nm)
- 3.6 rear axle, 1.5-way Kaaz Differential
- 3" exhaust, 200 cell metal catalytic converter (essential for road-legal use)
INTERIOR/SAFETY:
- full cage in vehicle colour
- bucket seats (I like OMP First R, very comfy. Idk if they fit though... Need to research.)
- 6 point harness
- extra gauges -> oil temp, afr, BOOST, water temp
- 350mm Momo Mod. 69 (unintentional, I swear.)
- carpets stay in, rest goes. No A/C, radio, powered windows, speakers etc.
CHASSIS/SUSPENSION/BRAKES/WHEELS/TIRES:
- All the stiffness I can get. Beefy side sills, cage, strut braces, frame rails etc.
- Undecided on coilovers. Maybe Öhlins or BC Racing ER. Would rather save money elsewhere.
- Stoptech 280mm 4-piston Big Brake Kit (front), maybe just pads for the rear.
- no ABS
- Factory non-power-steering-rack
- 15x10" wheels, maybe König Dekagram, 6UL or Jongbloed JRW 500 (as seen on thecarpassionchannel if I can get them)
- 245/40/15 Nankang AR-1
EXTERIOR:
- Colour: I wanted something unique and yet not too flashy. Emphasis on "not too". Hardly gonna be discreet. The car will be painted in Midnight Purple III (LX0) by capable hands (certainly not mine).
- Flared/pulled fenders (don't like bolt-on fender flares) to fit the meat with sufficient clearance.
- Hardtop
- Big **** isn't possible (not road-legal), so maybe a little ducktail.
- Bumper cut
- Rectangular headlights (RX7-style)
The red car in the attachments (didn't find info on how to place pictures between text, sorry) will be used as a base for the build. First work (mainly stripping/rust removal) in progress -> see pics. Will continue to post pics with progress. The red NA is a 1993 model 1.6 (with proper oil pressure gauge, yay).
I've saved up a long time to make this happen, want to do it right and am thankful for any useful input/suggestions if you can think of something or spot a mistake on the way.
Looking forward to the journey!
Stay healthy
Peter
I'm Peter from Essen, Germany, registered here quite a while ago and have been reading through various threads on and off. I've already owned a naturally aspirated 1.8 1994 NA for the past 4 years which is restored/resprayed in mariner blue (first two pics below). I always wanted to turbocharge my car but wanted to go all in when I do it. Hence I never found the time or money to actually do it.
Originally, the plan was to turbocharge the blue NA, but as the car is basically finished as it is rn, I decided to keep the N/A NA as a reliable and somewhat usable/comfortable vehicle (not what my passengers usually say, lol) and build a completely new car from the ground up.
Long story short, the goal is to build a turbocharged, road legal (very worth mentioning as I'm located in Germany) no compromise, track-focused 1.8l NA. Plans/goals are as follows:
DRIVETRAIN:
- 450bhp -> ~380whp? on pump gas, built engine: non-VVT, machined head, +1mm Supertech valves, Supertech valve springs, aggressive cams, K1 rods, Supertech 84mm 8.6:1 pistons, ACL bearings, ARP studs, boundary stage 2 oil pump, cooling reroute, 1000cc injectors (maybe paired with DW200 fuel pump, have to look up if necessary), sturdy engine mounts, no torsional damper -> no A/C or power steering.
- Currently undecided on which turbo to use: I like the modern technology and efficiency of EFRs (e.g. 7163), have heard a lot of good things about the new G25-550/660 but also like the character that comes with the spoolup and subsequent "punch" of the oldschool GT 3071/3076. Happy about input on that matter. Aiming for a high a/r, not too concerned with ultra-early spoolup in a track use context.
- Cooling: Reroute, proper heatshielding, Mishimoto radiator, Mishimoto fan shroud kit, any good intercooler, Oil cooler, hood vents (e.g. Singular Motorsport) or a hood with vents (I like the AD9 Carbonmiata hood but that's hard to get around here), and some airflow management.
- MS3
- Kraken cast manifold
- OEM 6 speed with straight cut gears (Quaife or similar) which will hopefully help with handling the torque. Plus the sound is awesome. Racecar streetcred etc.
- ACT 6-pad clutch (sprung, rated for 550Nm)
- 3.6 rear axle, 1.5-way Kaaz Differential
- 3" exhaust, 200 cell metal catalytic converter (essential for road-legal use)
INTERIOR/SAFETY:
- full cage in vehicle colour
- bucket seats (I like OMP First R, very comfy. Idk if they fit though... Need to research.)
- 6 point harness
- extra gauges -> oil temp, afr, BOOST, water temp
- 350mm Momo Mod. 69 (unintentional, I swear.)
- carpets stay in, rest goes. No A/C, radio, powered windows, speakers etc.
CHASSIS/SUSPENSION/BRAKES/WHEELS/TIRES:
- All the stiffness I can get. Beefy side sills, cage, strut braces, frame rails etc.
- Undecided on coilovers. Maybe Öhlins or BC Racing ER. Would rather save money elsewhere.
- Stoptech 280mm 4-piston Big Brake Kit (front), maybe just pads for the rear.
- no ABS
- Factory non-power-steering-rack
- 15x10" wheels, maybe König Dekagram, 6UL or Jongbloed JRW 500 (as seen on thecarpassionchannel if I can get them)
- 245/40/15 Nankang AR-1
EXTERIOR:
- Colour: I wanted something unique and yet not too flashy. Emphasis on "not too". Hardly gonna be discreet. The car will be painted in Midnight Purple III (LX0) by capable hands (certainly not mine).
- Flared/pulled fenders (don't like bolt-on fender flares) to fit the meat with sufficient clearance.
- Hardtop
- Big **** isn't possible (not road-legal), so maybe a little ducktail.
- Bumper cut
- Rectangular headlights (RX7-style)
The red car in the attachments (didn't find info on how to place pictures between text, sorry) will be used as a base for the build. First work (mainly stripping/rust removal) in progress -> see pics. Will continue to post pics with progress. The red NA is a 1993 model 1.6 (with proper oil pressure gauge, yay).
I've saved up a long time to make this happen, want to do it right and am thankful for any useful input/suggestions if you can think of something or spot a mistake on the way.
Looking forward to the journey!
Stay healthy
Peter
Last edited by Pita; 05-13-2020 at 10:14 AM.
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05-13-2020, 07:48 AM
#2
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Join Date: Mar 2017
Location: GER
Posts: 759
Total Cats: 113
Greetings from Paderborn!
Really nice NA (the blue one).
You want a depowered power steering rack, it's quicker!
If it was me, i wouldn't run 450 crank hp on track, it's going to be VERY VERY VERY expensive... like Porsche expensive, if you use, what you have.
Turbo choice is not that big of a deal, if you don't care about spool all that much. A 3071 should make all the power up top you ever need.
Saw one locally on ebay kleinanzeigen for 450€ in good condition! Maybe the saved money is better invested somewhere else...
For reliability i would taper the boost to the top, trying to keep the 6 speed alive. Like holding 380nm all the way to 7500, that should be around 400hp at the crank.
I will follow this very closely, very interested in what you end up with
Really nice NA (the blue one).
You want a depowered power steering rack, it's quicker!
If it was me, i wouldn't run 450 crank hp on track, it's going to be VERY VERY VERY expensive... like Porsche expensive, if you use, what you have.
Turbo choice is not that big of a deal, if you don't care about spool all that much. A 3071 should make all the power up top you ever need.
Saw one locally on ebay kleinanzeigen for 450€ in good condition! Maybe the saved money is better invested somewhere else...
For reliability i would taper the boost to the top, trying to keep the 6 speed alive. Like holding 380nm all the way to 7500, that should be around 400hp at the crank.
I will follow this very closely, very interested in what you end up with
Last edited by der_vierte; 05-13-2020 at 08:56 AM.
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05-13-2020, 08:24 AM
#3
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Thread Starter
Join Date: Nov 2016
Location: Essen, Germany
Posts: 17
Total Cats: 0
Grüße zurück 
Thanks!
Regarding the steering rack: I am aware that the PS rack is quicker, however the red NA already came with a non-PS rack. In advance I read a bunch of comments/opinions about preferences on depowered PS rack vs. factory non-PS rack. Most opt for the depowered rack, some prefer the OEM one... However: I've driven a NA without PS (factory non-PS rack) and loved the feel of the steering. My blue NA has PS, so I am used to the ratio and I honestly could barely tell a difference. Even if a depowered rack may be better, I will be very happy with the factory non-PS rack.
You're absolutely right, 450bhp is not what I want to constantly run on track. I didn't mention that at all in my original post: That's more like a virtual goal for what the engine should be built for so that I can be - at least kind of - safe at 380/400bhp or whatever. I will certainly reduce bhp/torque on track for reliability purposes.
The 3071 should be able to provide all the power I need, that's true. The thing is that I really admire the engineering behind the newer turbochargers. I've heard good and bad things related to track use for both options. Now that I think about it... As I'm also gonna use the car for the occasional rip on public roads, moar boost before 4000rpm might be quite nice too. In other words - if there are no real downsides to using the early spoolers I might end up using a EFR/G25... I don't know. Curious to hear what others think.
Quaife sadly won't confirm numbers on the capability of the gears above stock power, so time will tell I guess. In the threads that I've read on gearboxes it seemed like either the gears themselves (especially 4th) or the case are prone to breaking/cracking. I figured that the forces pushing the gears sideways (basically along the axis of rotation) can be eliminated when using straight cut gears. Given that the material of the gears holds up, I reckon that the resulting 6-speed should be capable of handling more torque. The question is just... how much
Glad that you find this interesting I'm just as curious to see where this goes.
Greetings
Peter
Thanks!
Regarding the steering rack: I am aware that the PS rack is quicker, however the red NA already came with a non-PS rack. In advance I read a bunch of comments/opinions about preferences on depowered PS rack vs. factory non-PS rack. Most opt for the depowered rack, some prefer the OEM one... However: I've driven a NA without PS (factory non-PS rack) and loved the feel of the steering. My blue NA has PS, so I am used to the ratio and I honestly could barely tell a difference. Even if a depowered rack may be better, I will be very happy with the factory non-PS rack.
You're absolutely right, 450bhp is not what I want to constantly run on track. I didn't mention that at all in my original post: That's more like a virtual goal for what the engine should be built for so that I can be - at least kind of - safe at 380/400bhp or whatever. I will certainly reduce bhp/torque on track for reliability purposes.
The 3071 should be able to provide all the power I need, that's true. The thing is that I really admire the engineering behind the newer turbochargers. I've heard good and bad things related to track use for both options. Now that I think about it... As I'm also gonna use the car for the occasional rip on public roads, moar boost before 4000rpm might be quite nice too. In other words - if there are no real downsides to using the early spoolers I might end up using a EFR/G25... I don't know. Curious to hear what others think.
Quaife sadly won't confirm numbers on the capability of the gears above stock power, so time will tell I guess. In the threads that I've read on gearboxes it seemed like either the gears themselves (especially 4th) or the case are prone to breaking/cracking. I figured that the forces pushing the gears sideways (basically along the axis of rotation) can be eliminated when using straight cut gears. Given that the material of the gears holds up, I reckon that the resulting 6-speed should be capable of handling more torque. The question is just... how much
Glad that you find this interesting
I'm just as curious to see where this goes.Greetings
Peter
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