EFR 6258 vs 6758 - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 11-12-2014, 12:47 AM   #21
Supporting Vendor
iTrader: (6)
 
Join Date: Mar 2005
Location: Broken Arrow,Ok
Posts: 1,061
Total Cats: 40
Default

If E85 is available, that's likely your best bet for safely increasing boost and timing for more power. This would require an upgraded e85 compatible pump, 750-1000cc injectors and obviously some tuning (you may have some of these items already).

This turbo will flow a max of 44lbs/hr which is roughly 440hp. As others have stated, nearing 400hp (and sometimes less than that) the drivetrain is on borrowed time even with a 6-speed and a torsen.

I have to ask, if its a rocket already and your are happy with it, why not just drive it for a while?
TheBandit is offline   Reply With Quote
Old 11-12-2014, 01:00 AM   #22
Senior Member
iTrader: (6)
 
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30
Default

Quote:
Originally Posted by TheBandit View Post

I have to ask, if its a rocket already and your are happy with it, why not just drive it for a while?
Because the only thing better than enough cocaine is more cocaine.
albumleaf is offline   Reply With Quote
Old 11-12-2014, 01:06 AM   #23
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,091
Total Cats: 90
Default

Quote:
Originally Posted by 18psi View Post
2" ic piping, if I'm not mistaken, should max out near 400hp at full tilt assuming no sudden bends or anything
You know what. I think maybe everyone else did all this math for non compressed flow. A car turbo pushing 300cfm at 30 psi (should be closer to 450hp) through 5 feet of 2" ic piping with 4 90 bends is only losing loosing ~0.14 psi to pumping loss. A normal 12psi @ 170cfm 250hp setup is loosing like 0.08psi in the piping. I estimated each 90 bend at r=2d to be equal to an additional foot of pipe for my rough math. Looking at the numbers thats nothing I'd worry about, its still typically being eclipsed by the IC at that point. The fact that my math draws the conclusion that everyone over looked a basic condition kind of makes me want to do it over tomorrow.
Leafy is offline   Reply With Quote
Old 11-12-2014, 01:46 AM   #24
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,353
Total Cats: 1,319
Default

Since when did The Forum Collective decide that Torsens and MSM diffs are questionable at 400whp? Are there a bunch of broken diffs that I haven't seen?

IMO, the diff is bombproof. Axles too, as long as it's a street car that doesn't get launched. Tranny needs to go at 400whp, though.
Savington is offline   Reply With Quote
Old 11-12-2014, 01:50 AM   #25
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,163
Total Cats: 2,573
Default

He's got a street car, but has been talking about taking it to the track on sticky tires
18psi is offline   Reply With Quote
Old 11-12-2014, 02:12 AM   #26
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 197
Default

Quote:
Originally Posted by Savington View Post
Since when did The Forum Collective decide that Torsens and MSM diffs are questionable at 400whp? Are there a bunch of broken diffs that I haven't seen?

IMO, the diff is bombproof. Axles too, as long as it's a street car that doesn't get launched. Tranny needs to go at 400whp, though.
I've regularly seen Torsens break on ~400whp/350rwtq street cars, after a single street (ie medium to low grip surface) launch.
Reverant is offline   Reply With Quote
Old 11-12-2014, 02:43 AM   #27
Senior Member
 
Join Date: May 2008
Location: Canada
Posts: 508
Total Cats: 104
Default

My Torsen blew up at the dragstrip, but it took a prepared (sticky) surface and wheel hop to get there. Before that, it survived countless launches at autocrosses, etc. As long as the wheels can spin, it acts as a fuse for driveline components (except for the transmission which, as Sav points out, has a finite torque capacity).
DeerHunter is offline   Reply With Quote
Old 11-12-2014, 08:39 AM   #28
Senior Member
Thread Starter
 
Join Date: Feb 2009
Location: Philadelphia
Posts: 815
Total Cats: 47
Default

It's a Torsen but not stock. Cryo treated with upgraded hardware inside. It also has a solid sleeve compared to stock.
Mazdaspeeder is offline   Reply With Quote
Old 11-12-2014, 10:38 AM   #29
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 781
Default

I wouldn't worry about the rear end at all.

Sticky drag radials would actually help it survive.

Trans is going to be the pucker factor.
concealer404 is offline   Reply With Quote
Old 11-12-2014, 11:06 AM   #30
Junior Member
iTrader: (1)
 
Join Date: Feb 2013
Location: Windsor, Ontario
Posts: 404
Total Cats: 64
Default

Quote:
Originally Posted by concealer404 View Post
Sticky drag radials would actually help it survive.
Until you dead hook.
BoostedSmurf is offline   Reply With Quote
Old 11-12-2014, 11:09 AM   #31
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 781
Default

Quote:
Originally Posted by BoostedSmurf View Post
Until you dead hook.

That's a good thing. Sidewall flex is safe.

Wheel hop on street tires is bad.

Rubber band vs. jackhammer.
concealer404 is offline   Reply With Quote
Old 11-12-2014, 11:11 AM   #32
Junior Member
iTrader: (1)
 
Join Date: Feb 2013
Location: Windsor, Ontario
Posts: 404
Total Cats: 64
Default

A bias-ply slick will wrinkle and give that extra cushion you want but a drag radial wont have that cushion or at least as much. Dead hook on a radial breaks parts.

I totally get where you're coming from with wheel hop, street tires at the drag strip are the worst lol
BoostedSmurf is offline   Reply With Quote
Old 11-12-2014, 11:13 AM   #33
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 781
Default

You really think a dead hook on a radial is going to be harder on your rear end than a hippity-hip-hip-hop street tire? Come on now.
concealer404 is offline   Reply With Quote
Old 11-12-2014, 11:15 AM   #34
Junior Member
iTrader: (1)
 
Join Date: Feb 2013
Location: Windsor, Ontario
Posts: 404
Total Cats: 64
Default

Quote:
Originally Posted by concealer404 View Post
You really think a dead hook on a radial is going to be harder on your rear end than a hippity-hip-hip-hop street tire? Come on now.
Oh not at all. Wheel hop is the devil. Drag radial is a step up from a street tire for sure. I'm just saying the radial wont give that cushion and that initial shock will still break things. Slicks and skinnies are where its at though.
BoostedSmurf is offline   Reply With Quote
Old 11-12-2014, 11:19 AM   #35
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,163
Total Cats: 2,573
Default

Drag radial will not dead hook most the time. It will hop, and because it is stickier than most others it will cause way more damage than some dinky all season which will spin like crazy.

A wrinkle wall slick will load up and dead hook, which is what he was getting at.

*edit: +1 what smurf is saying
18psi is offline   Reply With Quote
Old 11-12-2014, 11:26 AM   #36
Elite Member
iTrader: (1)
 
Join Date: Jun 2014
Location: Austin, TX
Posts: 2,842
Total Cats: 271
Default

Quote:
Originally Posted by Mazdaspeeder View Post
How much more boost can I run with 93 octane and ~8.6-8.8 compression?
+1 to running ALLOFIT

IMO, I'd max out fuel/boost/timing with 93oct on the 62 (or 67 )

Wouldn't bother with E85 on those pistons.
Girz0r is offline   Reply With Quote
Old 11-12-2014, 11:30 AM   #37
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,163
Total Cats: 2,573
Default

Quote:
Originally Posted by Girz0r View Post
Wouldn't bother with E85 on those pistons.
huh?
why not?

Its not like you NEED high comp for e85.
18psi is offline   Reply With Quote
Old 11-12-2014, 11:58 AM   #38
Elite Member
iTrader: (1)
 
Join Date: Jun 2014
Location: Austin, TX
Posts: 2,842
Total Cats: 271
Default

Quote:
Originally Posted by 18psi View Post
huh?
why not?

Its not like you NEED high comp for e85.
Well yea.. not saying 'not possible'. Just sounds like OP has more wiggle room with 93oct currently. E85 fuel WOULD be the next thing on the list after 93oct limits are met.
Girz0r is offline   Reply With Quote
Old 11-12-2014, 12:39 PM   #39
Elite Member
iTrader: (10)
 
soviet's Avatar
 
Join Date: Jan 2010
Location: VA
Posts: 3,516
Total Cats: 255
Default

yeah.... good luck getting to MBT on 93oct and >20psi, no matter what your compression ratio is.

I'm fairly certain my 400whp, 93oct, 25psi(?) tune was detonating and I think it was single-digit timing in boost.

For "ultimate glory" I'd do:
- EFR 7163
- E85
- boost by gear
- traction control
- dual-port wastegate and 4 port EBC solenoid so you can run lower psi in first few gears
soviet is offline   Reply With Quote
Old 11-12-2014, 12:40 PM   #40
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,091
Total Cats: 90
Default

What tranny? A T10 looks better and better by the minute.
Leafy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Fab9Tuning's NC MX-5 Turbo Kit Discussion- EFR/Garrett V-Band FAB Prefabbed Turbo Kits 216 03-22-2017 05:00 PM
The "other" spool question stefanst DIY Turbo Discussion 44 09-28-2015 08:16 PM
EFR 6258 Turbo Setup FOR SALE!!! wittyworks Miata parts for sale/trade 40 02-18-2012 09:06 PM
1.8L DIY Turbo Set-up with BorgWarner EFR-6258 derber DIY Turbo Discussion 51 06-30-2011 07:36 AM
Exhaust Manifold backpressure question Der_Idiot DIY Turbo Discussion 10 06-27-2011 01:29 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:32 PM.