Joe assuming you are talking about my car I think it was about 230tq I never got a print out remember I have a tmic this is getting changed or I am getting meth injection, and my motor is stock port built by me I only cleaner the casting flash ports were not enlarged and running stock timing!

 

Yea Kev your would be one of the stock turbo cars I'm talking about. Couldn't recall the TQ though, thanks

 

Nice numbers, the graph displayed by stevensimon is mine. It is very possible that the cold has affected both the octane requirements and your power. My dyno chart was on a dyno that reads like a mustang dyno (conservatively) and was done in the middle of july with ambient temps reaching 101 that day. The afr's on my graph aren't correct because I didn't run the dyno sniffer.
Either way, good build. You have a slightly larger port than mine if it is infact a large streetport. Mine is a pineapple medium streetport with slight modification. Good work, hopefully that thing lasts for ya. I have been running mine on premium (91 around here) since I built it for safety sake. Beware detonation, it sounds like rattling plastic dash pieces so it can be there and you wouldn't know it lol.

Anyways congrats, I haven't posted in a while, so I had to stretch my fingers :P

 

i've yet to experience any detonation on this engine. and it is a very large port based on a judge ito template.

 

nice numbers.

 

Good numbers, you might want to take a look at you lim gasket, I had the same problem, and the second I changed it (it had a big crack) my boost problems went away when I still had my fc.

 

^^
If you are talking about the boost tapering off towards redline.... its the small stock turbo, not a boost leak. The engine literally consumes too much and the compressor isn't big enough to feed the motor. Been around the block several times with boost leaks for sure.

 

ok, no problem, I was running a hybrid stock hot side with a upgraded cold, and it would taper down to 6 psi, as a matter of fact it would never hit anything above 9psi, I never heard the leak on the car and we where looking. One of my friends mentioned to me that I should take a look at the lim gasket, I did, took it off and found out that it was split in 2. Replaced it and 12 psi all the way to red line. But if your sure that that is not the case with you then no worries.

And I was running a stock engine no porting.

 

Mine definately will get above 9 psi, but the stock turbo just won't hold it till redline. I understand what you are saying though.

 

Very impressive!

 

date on the camera is wrong, sorry haha.

motor has around 3,000 miles on it. havn't checked compression lately...

if anything clipping the wheel would help a little with the psi dropoff.

 

What kind of setup do you have? Is the boost drop off normal with the wastegates? I just got my car tuned and I was expecting way more hp....

 

how consistant does your turbo hold boost while running thru the gears? With my boost controller it would consitantly over boost and under boost but was never really steady

 

From my understanding the boost tapering off as engine speed increases is a result of excessive backpressure being created in the small hot side which reduces turbine wheel efficiency. I had an instructor at my school that had good results porting the exducer bores in VW Jetta turbos 2-3mm's. Shouldn't be too hard when the turbos off, remove the hot side and give it to a machine shop, have them port it and the wastegate. You will lose boost response though.

In the end it'd probably be too much money for the POS stock turbo though.

 

On these cars, the compressor does not flow enough air to hold boost above 6psi to redline. This is why hybrid stock turbos can hold more than that to redline and completely stock turbos do not. Make sense?
Rotary motors consume a lot of air, the stock turbo was never really meant to go over about 8psi in the first place.

 

Makes sense. Appreciate it!