Acheiving 400hp from an SR

[DeanS15]

i made 305 atw on a 2871r @ 1.35bar - theres more in it so this turbo can probably flow enough to whisper in 400's ear, be lucky to pass it though......thats on 256 poncams and a fairly rich map. cant find the wheel graph though, its somewhere around...

[Drifter]

Odessa what boost were you running to get those figures mate?

It's the dotted line on the 2nd graph, peaks at just over 1.4 bar and drops to 1.2 bar at the redline

[OdEssA]

Odessa what boost were you running to get those figures mate?

It's the dotted line on the 2nd graph, peaks at just over 1.4 bar and drops to 1.2 bar at the redline

1.3 bar, but the highest peak i have on the commander is at 1.38 bar

[Scottie]

a 740inj is a must for both versions of the 52 trim.. a 555 is maxed out at redline @ 1bar boost..
even an FPR to stretch the legs of the 555 is not really a good option.

The 555's can cope with much more than 1 bar boost, even on the standard FPR.

Over the years at local events we have seen cars quite happily running between 1.4 and 1.6 bar on a 2871 with 555's and a perfect fuel ratio.

My own car has run 1.3 with spare capactiy in the 555's.

I agree 740's are better from the start if that's what you are aiming for, but a Tomei FPR is a direct fit and gives a little bit mroe safety for otherwise maxxed out 555 injectors.

[martinbattye]

The 555's can cope with much more than 1 bar boost, even on the standard FPR.

Over the years at local events we have seen cars quite happily running between 1.4 and 1.6 bar on a 2871 with 555's and a perfect fuel ratio.

My own car has run 1.3 with spare capactiy in the 555's.

I agree 740's are better from the start if that's what you are aiming for, but a Tomei FPR is a direct fit and gives a little bit mroe safety for otherwise maxxed out 555 injectors.

from my experience... not looking at others.. the 555 is maxed out i.e 100percect at 350-360hp@ sensible AF.

whereas a 740 will be around the 70-74percent for same power..

your car is clearly not making the most out of its boost then.. .

the quote that the inj are maxed @ 1bar at redline is from a car with the Greddy td05 18g.. which has very similar comp flow characteristics to that of the 52trim gt2871r.

regardless of boost used.. that is only a PR to allow a comp wheel to flow that much air.. a 555 is a bad match to a 2871r.. esp if you are chasing 400hp

[AP2]

Well just to throw something into the mix here is the WHP figures for my Standard bottom end running 56trim 2871r with a set of cams

[IMG]

Power and Torque

[IMG]

[Scottie]

your car is clearly not making the most out of its boost then.. .

Wouldn't you need to know the bhp it made at 1.3bar to make that statement though

It was a completely standard engine and cams at the time, on a DD RR at 1.15 bar on a 2871 it made 319bhp which I was happy with.

Many tuners with very good reputations are happy to map very close to 400 with 555's and an uprated FPR, and they are ones known for safe maps.

My car should be mapped within week so I guess I'll find out very soon

[kingj]

1.3 bar, but the highest peak i have on the commander is at 1.38 bar

thanks mate Im running 1.5 but havent RR'd it yet arse dyno says its all good though!!

[martinbattye]

Well just to throw something into the mix here is the WHP figures for my Standard bottom end running 56trim 2871r with a set of cams

56trim is the BEAST!! lol

[martinbattye]

Wouldn't you need to know the bhp it made at 1.3bar to make that statement though

It was a completely standard engine and cams at the time, on a DD RR at 1.15 bar on a 2871 it made 319bhp which I was happy with.

Many tuners with very good reputations are happy to map very close to 400 with 555's and an uprated FPR, and they are ones known for safe maps.

My car should be mapped within week so I guess I'll find out very soon

ah you missed out the uprated FPR before huh!

still puts inj duty in the very high region. (personally im not happy increasing base pressure by too much.. puts too much strain on pump and decreases flow at high boost)

your power figures are very conservative.. is your turbo the 48trim??

[redsx94!]

GT2871R trim 52 A/R 0.86

Flywheel:

Rear Wheel:

That's quite a big bit of correction there. I had mine done on dastek rollers and made 325whp and 357fwhp @1.4bar

Spec
Standard head
Forged bottom end 1mm oversize
Gt2871r .64
Deatschwerks 740's
1.6mm cometic gasket

[DeanS15]

the .86 should surely be making more than that?

my 0.64 is spitting out exactly the same figures almost, 357.5 atf/305 atw 345ib/ft....thats at 1.3 bar - i thought the 0.86 would rise above that, especially with more boost?

[OdEssA]

the .86 should surely be making more than that?

my 0.64 is spitting out exactly the same figures almost, 357.5 atf/305 atw 345ib/ft....thats at 1.3 bar - i thought the 0.86 would rise above that, especially with more boost?

There are many people that say they have 400 or more Bhp. with the 0.86 version, but none of them where on the APT rollers. Its well know that the APT rollers dont give the high power output like many other places

[DeanS15]

i use dyno dynamics in shootout mode - they are not optimistic at all as they give low returns on standard cars when compared to factory figures (my ex club all have mitsubishi fto's that i usually go with, these are a 197hp car from the factory and almost always return 180-190hp atf). two seperate runs on two seperate occasions months apart returned consistent results also......

i just thought that running a .86 at the same boost (on a forged engine) should produce a bit more power than that is all

[bahis]

That really does seem very low whp figure...

I mean I had 270whp with a broken GT2860R (almost 1cm axial play )

[OdEssA]

i just thought that running a .86 at the same boost (on a forged engine) should produce a bit more power than that is all

I totally agree with you I expected also more then 357Bhp. with 1.3bar boost

[Gary@APT]

try a .64 perhaps it will make more??

[TFD]

305 whp with a 2871 at 1.3 bar? That IS low. Made 276whp with a gt28r at 1.2 bar in my 100NX.

2nd of all, I curious why you all talk in BHP? drivetrainloss is NOT measured and therefore useless. Wheel HP IS measured and therefore the only way to compare results.

Well, back ontopic: I just put a 2871 0.86 56 trim / 740cc / z32 maf/ JWT ecu in my car and at 1.4 bar that things is just really fast... bit laggy but kicks in like a mofo.
Maf readings at 4.56V and 72% Dutycycle would guestimate 320-340 whp which would allready be at 400 BHP (about 50-60hp loss for a RWD). Ad cams and an intake minifold and see 380ish whp.

Good luck with your choice.

...oh... and all on a stock block.

[OdEssA]

try a .64 perhaps it will make more??

Gary, i went for the 0.86 version because everyone told me that the 0.86 will make more power then a 0.64 version
Anyway, i´m very happy with the performance of the car, so its does'n matter how many Bhp. i have on paper

[kingj]

305 whp with a 2871 at 1.3 bar? That IS low. Made 276whp with a gt28r at 1.2 bar in my 100NX.

2nd of all, I curious why you all talk in BHP? drivetrainloss is NOT measured and therefore useless. Wheel HP IS measured and therefore the only way to compare results.

Well, back ontopic: I just put a 2871 0.86 56 trim / 740cc / z32 maf/ JWT ecu in my car and at 1.4 bar that things is just really fast... bit laggy but kicks in like a mofo.
Maf readings at 4.56V and 72% Dutycycle would guestimate 320-340 whp which would allready be at 400 BHP (about 50-60hp loss for a RWD). Ad cams and an intake minifold and see 380ish whp.

Good luck with your choice.

...oh... and all on a stock block.

exactly what I have although Im using a 52 trim managed by apexi power FC, hits nice and hard at 4k doesnt it