how many of you auto cross with 35R's and how do you like it?
please elaborate on mods and porting. i am trying to get a feel as to if it will suit my needs for the street and some track use.

 

I'm interested in the same thing. I'm an autocross/ track junkie and I'm looking to go GT35R but I'm hesitant as to how people like it on the autocross track.

Thanks in advance.

 

one of my customers is running the rx7store gt35r kit on a stock port 13brew and it spools up plenty fast and has great top end, but honestly for a good street/ autox car i always recommend sticking with the twins.. especially sequential.

 

if any single turbo for autox I would go with a HKS T04E.

 

T04E, P trim with a 1.0 hotside!!! uber fast spool

 

+2

 

How fast are we talking? What kind of numbers on the big end?

 

I run GT35 on a large extended port motor. 1.06 AR hot side. 15psi at 4500rpm pulls hard all the way to 8500rpm and makes 450RWHP. 70% duty cylce. Need to crank it up some more.

Sorry dont auto cross, just daily drive and an odd track day. Have not yet had the setup on the track.

 

I would say 360-380 whp at 15psi at 3400 RPM, thats just a guess though, contact aspec or turblown since they specialize in these setups.

 

that's not much gain over what I'm making now, I think I'm gonna have to go gt35r with a divided t4 and a .86 hotside. I should be able to keep that spooled.

 

I have driven and played w/ alot of singles (pump gas) making up to 400 rwhp. I have found that there is not much difference in the two. Which is a really well tuned twins car and your average hoo hum smaller single set-up. Only disadvantage being the beating the twins take. If you are making 360-370 on twins make sure you do all your homework when going single. $6000 is alot for not much more performance. Yes $6000.. I larger intercooler ( to be in the proper efficiency zone). Too big an intercooler w/ twins and you are losing performance. Larger primaries/ rail, extra fuel pump, beefed up rearend (probably should have one of these now), another tune on the dyno/street and of course a well built/ fabricated turbo kit. Mine as well slap a 4' exhaust on as well. G

 

Given the facts that you could sell some of your previous parts will call the swap 5k.

 

Dont get me wrong.. I am planning my single route. Just do your homewrk. G

 

Thanks for the info. I've got 850 primary / 1680 secondaries, a Walbro 255 FP, HKS Twin Power with 9s all the way around, a PFS Medium SMIC w/ duct, solid rear-end bushing and solid trailing arms, all new SuperPro Bushings, 3 " dp and midpipe. Right now I'm looking at about $3500 for the kit and everything else is already there.


I like to do my homework up front but I wish I had done so before buying brand new '99 spec twins. Should have at least gone with the BNR Stage 3s but I won't be making mistakes like that again. I'm probably not going to pull the trigger for a little while because I did just buy the twins and they've only got about 4k on them. If I could sell the whole twin setup for around 2k I would do it over the winter but I think that might be a stretch.

 

I would take a bit of a hit to save the presumption of the BNR's failing in some way. Then you would be really on the downside. BNR's have a great rep. and you should be able to gaet $1850 for that set-up. Having most of the pieces of the puzzle I would pull the trigger on a single set-up now. How does the car feel w/ the super pro's ? G

 

Actually I was saying that I should have gotten the BNRs over the '99 specs so I have the '99 specs on the car right now with all new solenoids and the vacuum hose simplification done. The sequential system works flawlessly. I think I'm ready for more power though.

About the superpros, I couldn't be happier. The quality was top notch and I love the ride. I do have solid Pettit diff bushings though. On top of that I've got Koni Yellows with Eibach Pro Kit springs so the ride is a little stiff. Since I built the car to race it, I love it. I wouldn't hesitate to put the SuperPro Bushings on there, they are a great product and I have been very satisfied.

 

Right now, from my point of view, with a standard port motor, and a .82 rx7store.net kit GT35R, the spooling was very very fast, im talking about 1 bar @ 4400rpm and a kick in the teeth. My friend actually noticed my car twisting like a v8 powered muscle car coming from a stop.

Just make sure that you supply good lines for your wastegate and such, don't be cheap on the material, because I blew my motor with my new kit because my wastegate line melted because it was too close to the downpipe. So install braided lines and etc. Don't neglige anything. And I am planing on autocrossing the car next year, since im a big fan of it and think i've got the skills for it, and I'm pretty sure my single will be a huge advantage.

 

That number is way higher than what I've read. I'm looking for a setup that will at least make some boost by 3000 rpm.

 

Yeah that # seems a bit high. For full boost on that set-up. Sounds good. Thanks for the info. I would go single instead of the bnr's. G

 

My GT35R kit with T3 .82 hotside makes full boost (16psi) about 3700rpm. When I tried a 1.06 hotside (still T3) it made the same boost about 4200rpm. Hp numbers were around 400 with both though I'm probably limited somewhere else in my system, since I'd think the 1.06 should have made more.

-Andy

 

I drift with 1.06 T3 GT35R on my streetported S5 TII block. Considering trying out .82 housing eventually.....

 

how do you like the 1.06 T3 housing? does anyone have input with the T4 housing?

 

I've been told that the T4 divided is the better option as far as spool time and big end. Correct me if I'm off base here.

 

Have it for 2 or 3 years already, had no chance to compare with smaller housing yet, so its hard to judge.

 

Well I made 470 RWHP on 16psi 98 pump gas 70% duty cycle 1680cc 2ndrys with a 1.06 T3 hotside. Full boost at around 3600rpm, redline 8500rpm.

Will do some logging with my Datalogit to see exactly where she spools right up to max boost to give you more accurate detail. Its hard to test and it changes depending on the gear and rpm you start from with out logging it and having something to look at with out having to drive at the same time.