GT2871 USERS. SR motor

[EsChassisLove]

Originally Posted by AZ_BOY

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

Are you high? I've seen plenty of Sr20s making sub 400-400+rw on a 2871. I spent a day driving a 392whp Sr s14 through Seattle

You've been seeing some shitty SRs if they cant break 350rw

[codyace]

Originally Posted by AZ_BOY

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

.64 has been proven time and time again making 350-400+

My personal car, and cloned setups/copy setups all have made 390-410 whp.

[mattsil80wis]

Originally Posted by AZ_BOY

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

a cody ace built car

‪4-17-10 matt 240sx sr20 gt2871rs powered dyno‬‏ - YouTube

on a base tune...retune is being sent to me this week

[EsChassisLove]

Owhat dyno was that on?

And more info

[codyace]

Originally Posted by EsChassisLove

Owhat dyno was that on?

And more info

A small dyno jet/non load bearing...it's not very turbo car friendly at all...it doesn't provide realworld load so all turbo cars seem to spool later than they do on street, and don't make the torque they would either...oh well! Can't bitch too much as the dyno is always available to me/us.


My dyno 20psi


Here is a 28RS car with S3 cams, JWT ECU, same dyno (don't mind the top end fall off, stock FWD manifolds suck. 18psi




Here is Matt (sil80wis) car, dyno comparison. 20psi and 10psi

[codyace]

run files are available by email as well

[EsChassisLove]

Have to admit that torque curve is absolutely beautiful. Peaks at 4200 and holds strong till redline. I love it.

Can't wait to post what i make on Saturday. Stock head though.

[codyace]

Originally Posted by EsChassisLove

Have to admit that torque curve is absolutely beautiful. Peaks at 4200 and holds strong till redline. I love it.

Can't wait to post what i make on Saturday. Stock head though.

Stock head here as well, aside from JWT S3 Cams. No headwork no nothing.

[EsChassisLove]

Originally Posted by codyace

Stock head here as well, aside from JWT S3 Cams. No headwork no nothing.

Oh wow that's awesome. Pump gas also? No water/meth?

I'm expecting 350whp on 18psi. Going to be on a dyno dynamics also so it will read pretty low. I think.

[Kingtal0n]

Originally Posted by codyace

Stock head here as well, aside from JWT S3 Cams. No headwork no nothing.

Ah, the beauty of a high performance head from the factory. I think it took chevy about 20 years to catch up?

[LuckyX2]

First off I'd like to say hi as this is my first post here (started on nico a while back )

I have a s15 turbo redtop sr20det setup with poncams that just put out 293whp and 299tq; tuned by myself on my Haltech Platinum 1000. But after witnessing my little s15 turbo's inability to hold boost in the upper rpm's (spiked to 18psi, tailed to 12psi...) I've decided to move to the 2871/s3 combo.

Unfortunately, due to some some poor machine work on my head, my sr is in pieces now. The valve stems were machined down too far and the shims were pressing on the retainer before the valve stem because of that, thus loosening the keepers and eventually leading to one failing. I'm in the process of fixing it but the plan is to bring it back better than ever with a 2871 and some s3 cams.

I was wondering, Cody, that since I'm about 5 minutes from the Diehl's Paving you dyno at; would you be interested in meeting up when I go to re-tune? It's probably not going to be for a bit since I have to order valves, wait, replace them, measure clearances, order the shims, wait and then put them in but I thought I'd give a heads up.

My setup will be as follows:
Gt2871rs
S3 cams with adj. gears
Solid lifters and dual springs
Mild port/polish
LS2 Coils
Tubular exhaust manifold
Greddy FMIC
550cc (650cc @ 4bar) injectors with adjustable fpr
Walbro 255lph
3" exhaust
Haltech Platinum 1000 ecu

There's a few things I'm interested in seeing:
1.) 2871rs vs 2871r
2.) How much difference will cam timing produce in the powerband?
3.) What advantages will my extra head work bring? Solid lifters should produce more usable cam lobe area and thus more area under my power curve and also, I hope my handy work with a dremel payed off...
4.) Stock ignition vs. LS2's; any real benefit at this power level?
5.) Tubular vs. honed stock
6.) Standalone vs. Jim Wolf/Enthalpy

I feel like my car has a pretty unique set of supporting mods and could make for some interesting comparisons to yours, Cody. It's just a shame that there are too many variables to pinpoint what would be making the differences.

[BlackZenkiS14]

So the Extrude Honing process on an OEM manifold...what does that do for power/response? Im a fan of the OEM manifold myself, but would like to make it as efficient and powerful as possible. Considering doing this in the future.

[codyf44]

best cams for 2871r .86?

[codyace]

Originally Posted by BlackZenkiS14

So the Extrude Honing process on an OEM manifold...what does that do for power/response? Im a fan of the OEM manifold myself, but would like to make it as efficient and powerful as possible. Considering doing this in the future.

Extude hone stock manifold is the *only* way to fly. Cheaper than a tubular crack a fold, more efficient, and real deal boss. Plus if you go external you can't beat it.

Originally Posted by EsChassisLove

Have to admit that torque curve is absolutely beautiful. Peaks at 4200 and holds strong till redline. I love it.

Can't wait to post what i make on Saturday. Stock head though.

If it was a load bearing dyno you'd see it in the 3500-3800 rpm range where I hit full spool. With the 4.6 Final Drive the car is a rocket.

I went 11.65 @ 120 first time ever on slicks. A good driver would have that in the 11.0-11.2 range at the same power level/with my new boost control.

FWIW: My newest chip makes 12 psi at 5500 rpm. Thank you JWT.

Originally Posted by EsChassisLove

Oh wow that's awesome. Pump gas also? No water/meth?

I'm expecting 350whp on 18psi. Going to be on a dyno dynamics also so it will read pretty low. I think.

That's a pump gas number, my water injection is not setup to make more power, just detonation resistance. I don't trust a produce aisle sprayer pump.

Originally Posted by Kingtal0n

Ah, the beauty of a high performance head from the factory. I think it took chevy about 20 years to catch up?

You mean 40 years right? I wouldn't call LT1 heads anything special, nor Vortec.

Originally Posted by codyf44

best cams for 2871r .86?

If you insist on the .86 housing,

JWT S4 if you wanna run 20-24 psi. JWT S3 if you wanna run 18-20 psi.

[EsChassisLove]

Haha yea so my HKS actuator turned out to be a bit faulty. Very rare but hey it is possible.

I got tuned on 10psi. Don't remember what power I made.

I'm changing my set up now. External wastegate, 850cc top feeds, Blitz SBC, and water injection before I go back to the dyno.

[codyace]

Originally Posted by EsChassisLove

Haha yea so my HKS actuator turned out to be a bit faulty. Very rare but hey it is possible.

I got tuned on 10psi. Don't remember what power I made.

I'm changing my set up now. External wastegate, 850cc top feeds, Blitz SBC, and water injection before I go back to the dyno.

All internal gate suck. My HKS unit was no better than my Garrett unit...in fact the same junk.

External is boss

[codyace]

Originally Posted by SLiDe_WaYz

I'm using a HKS actuator, haven't installed it yet hopefully it isn't faulty.

Originally Posted by HIGHFIVEBETA

You meant all internal gates suck? Lol

Junk maybe harsch, but th eend result is all the same; crap


If you want to run reliable 15+ psi of boost, external is the way to go/PM me on how to make it all work.,

[SLiDe_WaYz]

Originally Posted by EsChassisLove

Haha yea so my HKS actuator turned out to be a bit faulty. Very rare but hey it is possible.

I got tuned on 10psi. Don't remember what power I made.

I'm changing my set up now. External wastegate, 850cc top feeds, Blitz SBC, and water injection before I go back to the dyno.

I'm using a HKS actuator, haven't installed it yet hopefully it isn't faulty.

[240ss]

Reviving this thread because i just finished my set up and think this thread is awesome and very informative! Im running the .64 a/r Made 368 whp and 295 f/lb @ 16 psi on a dynojet.

My setup is as follows:
s13 blacktop sr
stock bottom end
bc 264/264 cams w/ springs and retainers
metal hg w/ arp head studs
freddy intake mani
tubular exhaust mani
3" full exhaust
front mount
Apex'i Power FC

Just got it tuned today and would like to share my results. Tell me what you guys think.

[codyace]

Seems to spool a little later, and the torque cuve is a little funky, may be due to boost control though.

Good power though regardless!

[240ss]

yeah its probably due to the internal gate. after reading all about using the stock mani w/ external gate im really considering doing it. would that give me a quicker spool?

[codyace]

Originally Posted by 240ss

yeah its probably due to the internal gate. after reading all about using the stock mani w/ external gate im really considering doing it. would that give me a quicker spool?

No doubt the internal gate can cause some wacky wacky curves, as boost controllers are working overtime trying to make em work.

I've gone external now for 3 years, and love it. Holds boost, enables me to run low boost without any creep worry, and just in general seems to help build boost smoothly as it enables the boost controller to work regularly.

If you're interested, shoot me a PM as I have a local fab guy that does them for people.

[Luvs2slide]

^ I'm having done up by Cody as well. So easy to deal with!

On another note, it was previously mentioned that the wastegate hole needs to be dremeled out larger for boost spike/creep issues. I did this before i installed mine and never had any issues. Might want to look at dremeling out the hole as a temp solution.

[BlackZenkiS14]

Anyone using one of these Precision Turbos yet? They make one to directly replace the 2871R

http://www.precisionturbo.net/turboc...rger---5128/75

They claim to have better response and power output than Garret stuff...?

[180sxqc]

Anyone tried porting the stock manifold? Any good results? It's gonna cost me alot to send to manifold to the US from Canada, get it extruded-honed and sent back and I figured out I try only porting

Anyone?

[codyace]

Originally Posted by 180sxqc

Anyone tried porting the stock manifold? Any good results? It's gonna cost me alot to send to manifold to the US from Canada, get it extruded-honed and sent back and I figured out I try only porting
Anyone?

You could, and it's not going to hurt, but the extrude hone process is really the way to go.

[Pantaloons]

im running the precision 5557 ball bearing turbo and 11:1 compression pistons now

it spools 21psi at 3200 rpm


who needs v8s

[WhiteS12+1]

Mine finally went under the knife last night, after about 2 years of part collecting. Installing a freshly built head, JWT S3 cams, .64 turbo, and PFC. I can't wait to get all the bugs worked out and get some power numbers.

[codyace]

11:1 compression yowza!

[Silverbullet]

Any reason why BC 264 cams were never mentioned in this thread? Is the lift too high for the BC cams? They are 0.475" (12.06mm) which is significantly higher than the JWT, HKS and Tomei at comparable levels.