Lacking Air volume / Flow.
Heat soak.
Constricted exhaust.
If someone wants to shoot for some previously unseen performance I believe they will be found in the latest E-85 fuel. Higher octane, and burns much cooler. Little to no carbon buildup on pistons and valves... it is a sweet deal. You pay about $1 less for it than pump Premium too.
We have some good posts on this subject in our local Colorado Street racing board The Colorado Racing Network
Board Message <--- E85 Thread
Who bought Marka's T-type? I understand it was up for sale a few years ago. I wouldn't state that her turbo was "stock" because it was modified. The housing itself was "stock."There were other mods on that car as well. If the rules allowed it... why not? If there is a gray area... take advantage of it. :biggrin:
I purchased one of the first set of V2 intakes to come out... a handful were configured for front mount intercooled. Personally... to those of you who are "waiting" for such a set up I encourage you to just give in to converting over to the '86/'87 intake setup. The downfall of the V2 setup is it still retains the stock '84/'85 downpipe configuration. You gain more exhaust flow by converting over to a larger 3" downpipe in the '86/'87 configuration and don't risk your knock sensor going off everytime the '84/'85 setup smacks your frame or firewall. There are plenty of V2 pics on the MSN website.
The problem with E85 that no one likes to mention is your gas mileage drops by nearly 50%.