So evodan, how soon will your testing be done? Waiting on results from the TS setups, and love to actually see the hta35r ts setup be done w/results. Hope to read about it soon.

 

we have a little setback right now ''1 week'' so around monday 11-26-07 the 30r will dynoed...... then we install the 35r retune and redyno. then the hta mod if I decide to do it will be 2 3 weeks later....

 

You can definitely have the turbo re-done by FP and turned into a HTA. This is what i wanted to try with Mynes Performance Top Mount Twin Scroll Kit. Im just waiting on the dough but i know itll be a sick set up. Great low and mid with the ts, and hta. Nevermind the increased top end performance and spool with the Top Mount.

 

this is just awesome! best of luck

 

Gosh a lot of hype with pretty minimal amount of results.

a) DB himself said HTA does not offer any peak gains

b) nobody has tested swapping a PT .63 a/r for a PT .63 A/R GT35R except me

 

I was unaware that top mount manifolds resulted in increased top end performance. Anyone care to briefly explain how this works?

 

well if the turbo is in the normal spot you get all low mid ranges power. if its top mounted then you get all top end power. duuuhh

 

From what I have read regarding Peakboost's top mount kit help keep the turbo spooled when in higher RPM's because the *decreased* back pressure from the long runners. I believe it was called HVS. High Velocity Something ill have to get back to you on that one.

edit: head in the clouds after re-reading my own and ted b's post. And i went and looked back and in on another post concerning the 37R Top Mount and E-85 and how the top mount effects spool with the long runners.

 

All else being equal, lengthening the runners decreases exhaust pulse velocity. (FYI)

 

PeakBoost website says: " High Volume Solution allows for less manifold backpressure in the top end of the rpm band"

http://cheapturbo.stores.yahoo.net/peevhvsma.html

 

That seems to make sense in theory. However, I might note that relieving pressure by increasing primary volume (assuming this is in fact the case) would relieve it everywhere (like switching to a larger hotside), not just selectively in one place.

 

That is probably true, Ted. However, since there are more pulses and more gas when RPMs are higher, perhaps it simply refers to the fact that exhaust backpressure is likely to be higher at higher RPMS, and that situation is mitigated by the larger primary volume?

 

Yes, exhaust backpressure is greatest at the hp peak. What I was alluding to is the realization that increasing the volume of the runners or turbine housing sufficiently enough to alleviate pressure up top reduces it everywhere, including ranges that impact spool characteristics.

 

the HTA35R is a garrett 35R with a bigger 7blade compressor wheel. Thats it, just a bigger compressor wheel. The HTA modification does not change turbine wheel or housing, so you could easily use a twinscroll manifold and housing

That being said, twinscroll setups normally dont "like" mismatch turbos, so it might work well, and it might not. Hopefully we can do a back to back test of twinscroll 35R vs twinscroll HTA35R on Evodan's car

that is not entirely correct -- there is nothing at all wrong with using a single scroll turbo on a twinscroll manifold!!

you can send the twinscroll 35R to FP and get the HTA upgrade. You just NEED to make sure you get a twinscroll T3 Garrett 35R. The turbonetics twinscroll T4 flanged F1-35R will not work with the HTA!



i spend a lot of time in union beach (117 on the pkwy), thats where we do most of the east coast builds/fabrication. moving to matawan shortly!

sounds good chad! sean ivey was going to squeeze us in but i think he's been really busy lately. your dyno would be a great test facility for the TS 30R vs TS 35R test

top mount manifolds will not result in increased top end performance. If anything it would decrease the performance because of the convoluted downpipe you have to run...

i dont think that is correct

you are correct (again)!! im not sure if you remember david buschur's stock replacement header test, but a great comparison of this is RNR's stock replacement ramhorn (which lost power everywhere over stock). This is an indication of what happens when too big and too large a runner is used, all else being equal

 

Geoff,

In the context of Evo manifolds, what do you consider "too big and too large" a runner diameter?