The other level is one in which the turbo is upgraded, and performance is limited mainly by the transmission and later, the connecting rods.Ī. The first is that in which the stock 15G turbo is the major limiting factor in increasing performance, with a ceiling around ~270-300bhp. With these cars, there are basically two relatively easily attained levels of tuning. Stock exhaust has nice bends, but relatively small (~2.25") piping and very restrictive cat and muffler. Stock airbox design is excellent, pulling cold air from behind the grille, and can be easily modified to be even better. Not sure on stock boost setting, I'd assume it's around 10 for the T5's and probably 12.5 or so for the R's. (The European 850R received a 16T turbo)Īll HPT 70-series cars received 16T turbos (with the exception of the V70R's, which received 18T's in 98 and 99, and 19T's in 2000). Overview: The engines in these cars (850 turbos, T5's, T5-R's, and R's, as well as all 70-series T5's, all of which will be referred to as the HPT turbo cars as they are mechanically very similar) are 2.3 liter 20 valve DOHC designs, with a stock turbocharger and settings as follows:Īll HPT 850's received TD04HL-15G turbos, with stock boost for turbo and T5 models set at 9.6 psi, and T5-R and R models at 10.5 psi (stock hp are 222 and 240, respectively). The better M56H manual, and possibilities it opens up Limitations of the stock auto transmission, and options for improving itī. Upgrading the turbo and a new set of limitationsĪ. It is my hope that this post in conjunction with the pinned FAQ thread will be able to guide people to the answers to some of the more repetitive questions relatively easily.ī. There will be notes and information about other cars though as well. This will focus on 850 turbos primarily, as that is where the majority of my experience is. Since it seems multiple times every day, we have people asking the same questions again and again ("What mod should I do first?" "Can my car be fast?" "What's the best bang for the buck?" "Why is the sky blue?" "Has anyone modified 850 turbos?" etc), I am going to attempt to lay things out clearly for some of the noobs. Since then a few things have been taken out and added, and changed. This is the latest rendition of my intro to tuning these cars that I first wrote some years ago on VS and cross-posted over here.
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