well according to dave.. "the spool up is nearly identical to the HTA35r with more power over 6500 rpm. "

Id say the more power over 6500 didnt hurt..

 

We are testing a FS635 on a STI currently, its a wild turbo

It is spooling up slightly faster than the Gt35 that was on the car before, yet flowing significantly more air

This particular car previously made 560 whp at 30 psi with pump and meth at 4.9 volts mass air flow

Now when we put the FS635 and a new set of cams in the car is making nearly 500 whp at 26 psi of boost and nearing 4.8 volts maf, the car also made 475 whp at 23 psi which was really impressive

When you have a turbo that spools up faster or the same yet makes more power that is a winning combo

Initial impressions are WOW

I dont have time to finish the tuning as I must leave now for Ohio and then Texas for tuning. When we put it on the dyno the car was making so much low end TQ is tore our front dyno roller loose and we needed to take it off the dyno and do some repairs. So say it spools hard is an understatment.

I am exited to see where the tune takes us when i get back but it seems the customer has now outgrown the stock ecu and maf and needs a stand alone to realize the full potential of the Fs635 not to mention larger injectors and a stand alone.

When I have some time I intend to try this turbo on my STI also.

Al

 

Sounds like great results Al.. Please keep us posted on the results of this new BR turbo!! BR FTW!!

 

So it made 475 at 23psi.
then 500 at 26psi.
thats 25hp for 3 psi.
so 29 psi it will make 525, 30 psi 533? thats a bit shy of 35r 560hp.
I am not yet sharing your excitement.

 

Yes awd you are right on the money with your highly scientific psi->HP ratio, because HP always climbs in a directly proportionally progression, without fail.


I know your trying to give crude estimates but its nowhere near that easy or simple, efficiency changes as boost changes along with other factors, I would say there is not nearly enough information out there yet to be excited or disappointed.

Scorke

 

I like to look at injector duty cycle and mass air flow

Seeing that we are now close to maxing these out at a lower boost level we are obviously flowing more air at a lower boost

It remains to be seen how much power the car will make after we take out the very conservative "exploratory" style tuning mapping which has weak timing and rich a/f and dial the car in with the same more agressive style tuning it had when it previously made 560 whp at 30 psi of boost

If the MAF sensor is maxed out we either need to go with a larger MAF or convert to speed desnsity

As suggested above this customer wants to take the car on low boost for now and do the stand alone later

We'll see what happens when I get back from Ohio

I was very impressed with my initial FS635 impressions

 

Not to forget you also changed cams. Just look at tha ams cam test. Cams can have a drastic effect on power output, so i would say not enough info on this turbo.

Moreover, the turbo you previously had on the car is the regular gt35, not the hta. Typically the hta would spool better with more top end...

I'm not saying this turbo is not better than the hta35 yet - just that there is not enough information.

What would be nice is a back to back test of this turbo vs hta35

 

Also according to Dave its less HP under 6500rpm. I'd say the less power under 6500 does hurt, for a street car that is

 

Any new info of Fs635 vs HTA35 ?

 

Hey Dave, you need to get that 42R back on the car... AMS just went 8.42.

You guys need to make your E.T. Match you MPH so that you can shut them down.

Good Luck!! Cant wait to see more from the drag car and your RS.

 

Do the 3 amigos run the header style Buschur kit or the cast manifold? From VWJeffs myspace it looks like he has the cast manifold.

Thanks

 

VWJeff and I have the Buschur tubular header. SPIN2GST has the Full Race header.

 

that was before my build and that was my old 35r Buschur kit.

You didn't look at all the pics mang

 

We are still working on the suspension on the car. I don't care what "they" ran, once again it's a single run with no back up even close. Doesn't matter to me. I do not want a one pass wonder. The reason we took the 42r off is we couldn't make pass after pass that was the same and the car would not 60'. The smaller turbo has let us run consistent 8's now and has gone 166 mph, keep in mind that it's also on a standard EVO trans and our off the shelf race FMIC. I'm not even concerned with any new times that have been run.

We are having a lot more fun in our street cars anyway to be honest. My car ran 9.1 and my brothers ran a 9.6 last night. Much better times running those cars and hanging out with all the guys at the track then driving home.

 

I agree David, I could build an all out drag beast but then the car becomes a single purpose vehicle...I like something I can drive back and forth to work/track and requires much less prep.