0.64 or 0.86 hotside for 280whp goal on a 1.8
10-11-2010, 09:52 PM
#1
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Join Date: Mar 2010
Location: Glasgow, Scotland, U.K.
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0.64 or 0.86 hotside for 280whp goal on a 1.8
Planning on using the GT2871r to achieve 280whp read good things about it on here.
Was thinking of using a 0.86 for whatever turbo i get as the last thing I want is overheating at the track.......Something i hadnt thought of before was using a big turbo at low boost would i be better of with a 0.64 then if iam not using the turbo to its full potential then it shouldnt be creating too much heat????
I dont want to be raped on the straights or coming out of a hairpin bend which leads to a long uphill straight!
Was thinking of using a 0.86 for whatever turbo i get as the last thing I want is overheating at the track.......Something i hadnt thought of before was using a big turbo at low boost would i be better of with a 0.64 then if iam not using the turbo to its full potential then it shouldnt be creating too much heat????
I dont want to be raped on the straights or coming out of a hairpin bend which leads to a long uphill straight!
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10-11-2010, 10:52 PM
#3
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Join Date: Aug 2009
Location: MONROE CT
Posts: 1,102
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Planning on using the GT2871r to achieve 280whp read good things about it on here.
Was thinking of using a 0.86 for whatever turbo i get as the last thing I want is overheating at the track.......Something i hadnt thought of before was using a big turbo at low boost would i be better of with a 0.64 then if iam not using the turbo to its full potential then it shouldnt be creating too much heat????
I dont want to be raped on the straights or coming out of a hairpin bend which leads to a long uphill straight!
Was thinking of using a 0.86 for whatever turbo i get as the last thing I want is overheating at the track.......Something i hadnt thought of before was using a big turbo at low boost would i be better of with a 0.64 then if iam not using the turbo to its full potential then it shouldnt be creating too much heat????
I dont want to be raped on the straights or coming out of a hairpin bend which leads to a long uphill straight!
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10-11-2010, 11:34 PM
#4
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Join Date: Mar 2010
Location: Glasgow, Scotland, U.K.
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Engine wise is standard just now. Leakdown at 5% on all cylinders. Have 99 head waiting to go on. And fitting forged rods rods before putting engine back in the car.
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10-12-2010, 03:29 PM
#9
Red is the tune with out the water and meth
The orange is my old tune. I believe witht he techIII
The majenta(sp?) and blue are with meth injection.
I am down to hear some ideas on what to do here. My set up as is-is maxed out. I know it can be more efficient.
I believe the the Intake manifold and the exh manifold may be holding me back.
The key here is, I cant have my ftlbs come on any later than it is now. Its already bad. I know you folks here dont do what I do on the track, but response down low is really important. Especially when in tandem.
I am thinking the new BEGI IM and an absurdflow type manifold.
i was even thinking of going with a bigger turbo and using a shot of nitrous to get it going early..
Actually, I should move this thread.
SOrry for the off topic.
The orange is my old tune. I believe witht he techIII
The majenta(sp?) and blue are with meth injection.
I am down to hear some ideas on what to do here. My set up as is-is maxed out. I know it can be more efficient.
I believe the the Intake manifold and the exh manifold may be holding me back.
The key here is, I cant have my ftlbs come on any later than it is now. Its already bad. I know you folks here dont do what I do on the track, but response down low is really important. Especially when in tandem.
I am thinking the new BEGI IM and an absurdflow type manifold.
i was even thinking of going with a bigger turbo and using a shot of nitrous to get it going early..
Actually, I should move this thread.
SOrry for the off topic.
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10-12-2010, 05:32 PM
#11
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Location: Sunnyvale, CA
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For those not well-versed, my setup:
8.6:1 1862cc shortblock w/ MBSP and VVT
AEM EMS, ID1000s, E85
ABSURDflow manifold/DP
Genuine Garrett 2871R (TiAL .86 A/R exhaust housing)
Blox B18 Honda intake manifold + OEM B18 TB
So even though I have the larger .86 housing, the AF manifold/DP and VVT lets me spool FASTER, to the tune of 25ft.lbs more at 3500rpm and 10ft.lbs more at 4000rpm. 10psi more boost obviously means you crush me past 4200rpm, though.
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10-12-2010, 06:34 PM
#14
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Join Date: Jul 2005
Posts: 6,420
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For a street car use the smallest turbo that will hit your power targets. In the choices you gave that would be the 0.64.
If you really are OK with 280 whp, with an optimized setup a GT2860RS with 0.64 will do it. A GT2560 with a good setup will do 265 whp.
If you really are OK with 280 whp, with an optimized setup a GT2860RS with 0.64 will do it. A GT2560 with a good setup will do 265 whp.
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10-12-2010, 07:38 PM
#17
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Join Date: Jul 2005
Posts: 6,420
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Dem's probably dynojet hp. Dynojet horses are smaller than Dynapack horsies.
The 265 number I gave was for a Dynapack. Probably ~300 dynojet hp.
In any case, a turbo much bigger than you need for a given hp target, is a slower street car, due to a weaker low end and slower spool.
The 265 number I gave was for a Dynapack. Probably ~300 dynojet hp.
In any case, a turbo much bigger than you need for a given hp target, is a slower street car, due to a weaker low end and slower spool.
Last edited by JasonC SBB; 10-12-2010 at 08:34 PM.
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10-12-2010, 08:33 PM
#18
Very nice. Now see, I am very much into(jeleous) that 25ftlbs more you have at 3500. That is a big difference for me.
I am
9:1
1800cc
99 head
+1mm valves on both sides
head is cleaned up. All casting marked ect have been smoothed. Minimal bowl work.
AEM EMS V2
880 injectors
110 leaded fuel
Stock intake manifold gutted
Stock TB smoothed out
BEGI cast exh manifold
Genuine Garrett 2871r with garrett .64 exh
3" DP and exhaust all mandrel
I need to make some changes and that .86 doesnt sound to bad right now.
I have to research that VVT head..
Thanks for the post Sav
For those not well-versed, my setup:
8.6:1 1862cc shortblock w/ MBSP and VVT
AEM EMS, ID1000s, E85
ABSURDflow manifold/DP
Genuine Garrett 2871R (TiAL .86 A/R exhaust housing)
Blox B18 Honda intake manifold + OEM B18 TB
So even though I have the larger .86 housing, the AF manifold/DP and VVT lets me spool FASTER, to the tune of 25ft.lbs more at 3500rpm and 10ft.lbs more at 4000rpm. 10psi more boost obviously means you crush me past 4200rpm, though.
I am
9:1
1800cc
99 head
+1mm valves on both sides
head is cleaned up. All casting marked ect have been smoothed. Minimal bowl work.
AEM EMS V2
880 injectors
110 leaded fuel
Stock intake manifold gutted
Stock TB smoothed out
BEGI cast exh manifold
Genuine Garrett 2871r with garrett .64 exh
3" DP and exhaust all mandrel
I need to make some changes and that .86 doesnt sound to bad right now.
I have to research that VVT head..
Thanks for the post Sav
For those not well-versed, my setup:
8.6:1 1862cc shortblock w/ MBSP and VVT
AEM EMS, ID1000s, E85
ABSURDflow manifold/DP
Genuine Garrett 2871R (TiAL .86 A/R exhaust housing)
Blox B18 Honda intake manifold + OEM B18 TB
So even though I have the larger .86 housing, the AF manifold/DP and VVT lets me spool FASTER, to the tune of 25ft.lbs more at 3500rpm and 10ft.lbs more at 4000rpm. 10psi more boost obviously means you crush me past 4200rpm, though.
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