getting SR20 to 350-400 whp

[DOOK]

something to think about is that SRs part are a lot easier to come by than RB parts because we had them installed in a variety of cars here in the states. Can't exactly go down to the autozone and get a seal or something for an RB. Even if you don't decide to go with my setup I would suggest staying with an SR.

Originally Posted by 05civse

anyway, I think I may be loosing my mind. Now I am seriously considering pulling the engine and rebuilding the bottom end with forged pistons and new rods. I just noticed my front main seal is leaking a little, and I'm burning oil I figure out the rear turbo seal.

I don't know, the current bottom end gives me perfect comp. and 2% or 3% leak down on each cyl. (all the same). Would it be worth it to build it up? should I just say f it all and go to an rb25? I am questioning everything now.

I need some encouragement so I just don't give up.

choices:

-fix front main seal, then go to a bottom mount gt3071R, power FC, and big injectors ---like $3-$3,500

-Build bottom end, go to a T3 topmount, power FC, and big injectors--Like $5000

-sell SR, go to RB25 mildly stock --like $4,000

Would a built SR be way more fun than mild RB? Horsepower is horsepower i guess.

[liv2drift045]

25 is gonna be more torquy theorhetically. I've driven quite a few rb25's and after driving a built SR, I still prefer the SR. Keep the SR. You already have it. No sense selling it for another motor, and ordering a mount kit, driveshaft all that nonsense. Anyways do the cheaper of the 3. You'll still hit your power goal w/ that turbine, but theres been talk of the cheapo manifolds breaking up around this power. If you re-braced it/strengthened it I guess you'll be ok. If you can afford it get a set of cams. They'll help whatever turbo setup you choose. GL man.. DONT GIVE UP.

[driftertim]

-fix front main seal, then go to a bottom mount gt3071R, power FC, and big injectors ---like $3-$3,500

I think you should stick to your guns. You have an SR, it will make reliable HP's guaranteed. {Pick a Turbo which everyone else is runnign reliably and making good power all arround the powerband} Then the MAF and Injectors, a good tune. RBs are fun, they sound BAD ASS, but go with the motor the car was intended to have, Make 350+WHP. Your car will be Fast as FUZZ and youll enjoy it. BLOW YOUR MOTOR, and buy a new block, use your parts from the other motor and there you go again. SR blocks are dirt cheap. Dont give up man, we all wana see how our build comes about and you will enjoy it.

P.S. You dont necessarily need CAMS, put that money into a better Manifold (Tomei, Geddy, etc..)

Cheers,
Tim

[05civse]

Thanks, that is what i need to hear. I guess I have already done lots of work to the motor itself so I should just stick to it rather then go to a stock RB.

I am just having one of those days where my car is just pissing me off with everything, but I have put way way too many hours into it to just give up. One of my bigger fears with this is that after all of this work it will still feel slow to me.

Those of you with 350-400 hp 240's, would you say it was all worth it and it feels rediculously fast, or no?

My bottom end is in perfect condition, so I guess ill just run it stock till she blows and go with cams, power FC, injectors, cams, MAF, and then make a final decision on the turbo... gt2871R .86----bottom mount gt3071R T2---- GT3071R T3 top mount--- any other suggestions that I really should look into?

Thanks again for the support guys!

[Tearlessj]

Originally Posted by Ltdnismoracer4

are you talking to me?

Yes. Manifold looks very nice.

[DOOK]

guy out in washington state made it for me. Can't remember his name, it was John something. He does mostly honda/acura road racing team stuff but I had him do this one for me. It was expensive, he made it to what I wanted.

[05civse]

Would getting the 3071r in a t2 flange be a bad thing output wise?

I am thinking of just going

*gt3071r t2 bottom mount
*deatschwerks 740cc injectors
*power FC
*Z32 MAF or go to MAP setup

Run that till something breaks (manifold) Then go topmount and cams (unless I want more power sooner than that).
Staying bottom mount looks to save me over 1 G and net the same power without looking as bad ass.

Unless... will the 3071 fit as a bottom mount? anyone know?
does the 3071 come with an internal wastegate?

[DOOK]

may run into some steering shaft issues, don't know for sure though

[05civse]

right now my t25 turbo ext. devorced wastegate tube sits right on the steering shaft

[05civse]

so I decided on a top mount t3 setup. my only last choice now is the turbo. tons of people tell me gt2871r .86 and tons say gt3071r. I was planning on buying everything from heavy throttle as they have everything in one place. The only thing is they only sell the gt3076r and not the 71. I figure they know what they are doing, so would the 76 be much more laggy than the 71? I read somewhere that the 76 would spool very quick for its size. thoughts?

[steve shadows]

Originally Posted by 05civse

so I decided on a top mount t3 setup. my only last choice now is the turbo. tons of people tell me gt2871r .86 and tons say gt3071r. I was planning on buying everything from heavy throttle as they have everything in one place. The only thing is they only sell the gt3076r and not the 71. I figure they know what they are doing, so would the 76 be much more laggy than the 71? I read somewhere that the 76 would spool very quick for its size. thoughts?

It spools fast for a large turbo, but imo it still is not as formidable for response tune style setups (ie drifting and road racing tighter courses) etc.

the gt3071R would be your mate.

If your looking to go for the 500whp range max with some drag strip use, the 3076r is a good compromise and will yield great results on larger race tracks.



this is a dyno of a gt3071r maxed out i stole from my thread on turbos on FA

[FusionR240sx]

Originally Posted by driftertim

P.S. You dont necessarily need CAMS, put that money into a better Manifold

most cam setups are cheaper then getting a insane exhaust manifold. almost half the price.

right now i have -

eagle rods
BC 272's
CP pisonts 86.5mm
gt2871R .64
740cc's
300zx MAF
God Speed FMIC


i will be getting a dyno and tune soon...

[steve shadows]

it will be interesting to see how the 272's work out wiht that turbo. Kind of big imo.

[Dousan_PG]

those cams are too big
wtf.
get a real manifold

[steve shadows]

Originally Posted by Dousan_PG

those cams are too big
wtf.
get a real manifold

yeah with the .64 thats A LOT of overlap for such a small turbine.

Might have been ok for a 3071R , maybe.

But remeber kids' Brian Crower is not the same as HKS, his cams have a more conservative ramp angle and idle smoother, rev differently (slightly) and make power slightly differently (differnt that tomei and other jdm cam profiles also).

So theoretically it would work, I just think 264 stage 2's would be a better cam to match the turbos strong points in the power bands. like a lot better.

[Dousan_PG]

i wanted HKS cams but out of stockwhen i did mine
so i went w/ Toda

3071r.....mmm
2 months it mine. 2 months MAX. haha..i have the money now..must....control...
wish i had afull race twin scroll..sigh just stuck w/ a regular FR

[steve shadows]

Originally Posted by Dousan_PG

i wanted HKS cams but out of stockwhen i did mine
so i went w/ Toda

3071r.....mmm
2 months it mine. 2 months MAX. haha..i have the money now..must....control...
wish i had afull race twin scroll..sigh just stuck w/ a regular FR

yeah its a great turbo for almost anything with the stock disp SR.

i think the twin scroll setups are a little over-rated aaron, I have yet to drive one to compare (on SR) but dyno graphs and marketing have left a bad taste in my mouth for such an expensive piece.

If you drive one let me know-just make sure they both use the same turbine, everyone is comparing twin scroll 3071rs to single scroll 35rs and 30rs, and then they wonder why the car is so much more fucking responsive.

[Dousan_PG]

my friends have them.
went from single to twin scrolls
exact same motor setup same car and such
said night and day.

my friend had 3071R single scroll Full Race
went to 3071R twin

said wouldn't think of going back.

[steve shadows]

Originally Posted by Dousan_PG

my friends have them.
went from single to twin scrolls
exact same motor setup same car and such
said night and day.

my friend had 3071R single scroll Full Race
went to 3071R twin

said wouldn't think of going back.

yeah when i get a couple extra thousand bucks ill probably spring for one too.

[Dousan_PG]

'expensive" is relative.
haha
thats all it is.

[steve shadows]

yeah im trying to convince a couple other manifold manufacturers (when i have time to bitch over the phone at them) to get twin scroll platforms out and available. full-race is ths shit and their mild steel construction is better, but I have a good working relationship with PB (as of now ) and it would be cool if they could offer it as well.

anyways , couple thou is a couple thou, no biggie if you can afford cali living then you can save for a twin scroll haha

ill run my single for the rest of the summer until i feel like blowing the tires off even more.

[Grendel]

Originally Posted by statik

gt2871r .64 will hit 350whp, some have hit 400whp (codyace). You can stay bottom mount and you will have full boost by 3500rpm

as everyone else said, wideband, 740cc injectors, z32 maf if going maf, rom tune if not going standalone, and a good set of cams

Here is the link to Codyace's thread on FA, good info there: http://forums2.freshalloy.com/showthread.php?t=158176

[Turbocoop]

Originally Posted by 05civse

Top mounts look bad ass, but I am worried about the heat by the brake master cylinder. It gets hot mow and I have a ceramic-coated shield between it and the manifold.

it only took me like 45 minutes to make this heatshield out of aluminum


and youre right- top mounts do look badass

[picho]

oh by the way everything above is cool but i suggest you change your oilpump to be on the safe side sr20det engines are pretty old and pushing that kind of power ,you might wanna make sure you have oil up top of the head ive seeing engines blow many times.

[picho]

oh by the way everything above is cool but i suggest you change your oilpump to be on the safe side sr20det engines are pretty old and pushing that kind of power ,you might wanna make sure you have oil up top of the head ive seeing engines blow many times.

[05civse]

Originally Posted by steve shadows

this is a dyno of a gt3071r maxed out i stole from my thread on turbos on FA

some good dyno sheets in that link. what exact turbo do they mean when they just say gt30r?

would the potential of the 3076 be beter by alot over the 3071? or should I just buy a new turbo if I step it up a little more and just use the 3071 till then? It would be much more convienient to get all my parts from heavy throttle instead of several places. anyone know any good sites to order a bunch of stuff off of?

Thanks again!

[05civse]

I looked at my head and found two valves that pulled the seals up to the top of the valve stem so that the bottom of the umbrella part is above the top of the valve guide by like 1/4". Those are the two valves that leaked the most for obvious reasons. Are the USDM sr20's exhaust valves smaller than the JDM det's? anyone ever see this before?

[05civse]

one more thought, is there a too big for injectors? i know they will be slower and possibly not atomize correctly, but is 850cc too big? sounds huge, just wondering what the smallest size i should run for 400whp.

[Wei240]

injectors are dynamic, so you can even run 1000cc's if you wanted to,
you can always make adjustment with a standalone

850cc's are fine

even 740's are fine for 300-400 that you're looking for,

but if you do plan to upgrade, bump up, switch to a larger turbo, higher hp goals, you'd wish you'd bought larger injectors...

[05civse]

^^alright, thanks

can anyone comment on my other quetions?

thanks