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lemikson's Avatar
Join Date: Jan 2014
Location: Toronto, ON
Posts: 57
What spring rate for Tial 38 with stock ECU chips and no boost control?

Like title is saying is anyone running or familiar with what should be the spring rate for Tial F38 wastegate with stock DME chips and without any boost control upgrade (manual or electronic)?
I want to upgrade exhaust to 3 from downpipe flange to the end. With HF CAT and Magnaflow Muffler at the back. At the same time want to upgrade 30+ years stock wastegate into Tial F38. I was planning to put 14 psi spring rate but looks like it would be way too much of boost with the stock chips.
Any advice would be much appreciated.
Old 01-19-2018, 08:03 AM
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In the Fires of Hell.....
kdjones2000's Avatar
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 2,676
FYI, stock boost on these cars is 10 psig.

Can't tell you more about your Tial WG and settings, sorry.
'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG
3300 lbs, 256 RWHP, 15 psig boost
"Certified National PCA Instructor" Hoooohah!
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
Old 01-19-2018, 08:38 AM
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Join Date: Feb 2003
Location: East Bay
Posts: 1,461
You must emulate the stock wastegate with Tial. Not just 10psi max-boost in midrange, but also dropping boost down to 6-7psi at redline. Otherwise you'll blow engine because chips is only programmed to give enough fuel for 6-7psi @ redline. Any more boost than that with stock chips will blow headgasket.

Get Rogue A-tune kit first. Then install upgrades and reprogram for each step.
Old Today, 12:33 PM
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