Mellon: Check out posts by a list member who goes by the username of WOT. This guy ports throttle bodies and has some dyno results with TB and stock turbo.

 

nice find!

cliff notes

"The 65 mm throttle body, both ours and Works, did gain HP. No peak HP was gained but it smoothed out the dips in the run and in those dips the gains were 3-5 whp.


Next thing we wanted to try was the Extrude Honed intake with the 65 mm throttle body. This is when the testing went down hill and has cost me 5 nights of sleep. The power dropped. The boost dropped. I had the intake off the car 3 times, the throttle body off atleast 8 times. No matter what I did I could NOT maintain more than 16 psi of boost at redline. EVERYTHING was checked or eliminated. The only change was the intake and throttle body. The low end tire spinning monster was gone. The car was lazy to spool and had no boost at redline. Before the intake we were able to hold 19 psi in the 7,000-7500 range. Now max boost in that range was 16 psi. Power was down but I have to attribute this to the dropped boost as I know the Extrude Honed intake will make more power. Ended up no matter what we tried all we could make was 356 whp and 359 ft lbs.

We then decided something was terribly messed up. I bolted on our sheetmetal intake (Magnus builds it for us) with the 3" throttle body. Results were the same. 16 psi of boost at redline and even less power than the extrude hone with the 65mm!

Put the Extrude Honed intake back on and bolted the stock throttle body to it. With the intake hole opened up it made the 65 mm throttle body perform even better. 8-10 whp across the board was lost using the stock throttle body.

We (as a whole at the shop) came to the conclusion that the car was being choked down by the stock turbo assembly at this point. Yes, I know more power than this can be made on the stock turbo."


so they saw a power loss with the upgraded intake and throttle body and attributed it to the lower boost. What's confusing is that boost is just a measurement of backpressure and not indicative of power. I'd rather have a car that makes 350awhp @ 16psi then one that makes 350awhp at 20psi because it's choked up. Now if they had a boost leak I could understand seeing a power loss and lower boost, but a free flowing intake and throttle body that lowered boost should show gains because more air is moving through the engine instead of being backed up in the intake.

correct me if I'm wrong here... did they mis diagnose?

 

I found one of his for sale threads:

"I have a 65mm Throttle body for sale which comes with a brand new oem gasket bored to 65mm.

8-10 whp gain with amazing throttle response. "


I couldn't find any dyno data to back up the claims though.

 

ya I'm kinda thinking the issue was with the extrude honing because I don't know if they do that anymore; they just port out the inlet on the intake manifold to match up with the 65mm TB and then port match the runners where they meet the head.

I did a bunch of searching for all of this info a while back and david buschur was the one that had the most solid info. At this point though, they use this setup on several of their 600whp (mustang whp!) cars over some of the SMIM's out there so it can't be all that bad

 

yeah It's looking like one of those things I'll just have to find out for myself, I'm working with PPI to obtain the intake and throttle body, just waiting for them to firm up the price/core/shipping details before I'll pull the trigger.

 

I plan to send my stuff out to PPI also and get ported, then swain coated. I bought an extra manifold though because I heard it takes a few weeks for parts to come back.

Good luck and thanks for all the reviews of lately

Jason

 

Back when we originally tested the intake TB it was on a fairly stock car with the stock turbo.

Since that original testing we have installed I-don't-know-how many ported intakes and throttle bodies. With a Stage 4 car and an EVO green I'd expect to see a solid 15 whp from the car. Probably not 20 whp and probably not 10 whp, they usually come in right at 15 whp. I'd be surprised if dyno sheets can't be found somewhere showing those gains.

Remember, I am running 9.7's at 148 on our ported intake/tb, my brother is running 9.8 at 147, Trent just ran 10.17@142 tonight, tons of other examples of great performance with the parts.

There are some keys to making power with the two. They HAVE to match, if not, gains are low.

 

Thank you sir for enlightening us .

Now mellon go do some testing with that green for us on pump gas!!

Jason

 

check out the link in my signature.

i beleive it to be the only back to back oem tb vs. 65mm tb dyno compare published on evom.

test was performed 20 minutes apart. the oem intake was already enlarged, potentially helping the oem tb power numbers.

this test was also performed on 91 octane.

I changed tb's & performed this test in front of ~20 socalevo.net members too.

another great atribute of the 65mm tb is the transient response experienced when driving around town

 

Thanks.

I'm sure getting the intake manifold ported along with the TB to 65 mm would surely show gains. Thanks again

jason

 

That is what I was saying in my post above. You have to match the two parts. Doing just the TB with the stock unported intake shows small gains like my original test showed. It's the typical problem of trying to go from large to small and make it flow, just doesn't work well. They HAVE TO MATCH.

 

I would be happy with 15awhp, that's good bang for the buck in my opinion, now if I could just get your company to work with me on that 1000.00 core charge

 

Ya, if Buschur would start doing a core exchange program for TB's and Manifold combos it would be *really* nice for those of us who can't have their car down for weeks on end.

 

or just buy a spare OEM EVO t-body and intake manifold and not worry about downtime at all...

 

The intake/tb is not weeks on end. We have a very limited number of cores here, we can't do them on an exchange because people or just flat out too slow on swapping the parts out.

If you let us know you are sending yours in, we can port one and do a TB for you and have it ready for the day yours shows up. We could send the new parts right back out. If you want to do this, because you are in a hurry, call first so we can arrange it and make sure we have both pieces completely finished for you.