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sperry · 2005-10-31, 10:21 AM

I've got the TGV deletes on my car as well... but when you combine them with ported/polished WRX heads, an EJ257 shortblock, a GT30-10 turbo, Perrin FMIC, Perrin BigMAF, and 800cc injectors... well, you get some interesting results. Namely a tip-in throttle issue.

I'm being told the tip-in issue is mostly caused by the MAF and the large injectors (though I bet the added flow of the TGV deletes and heads don't help). Essentially, to handle the high-end of the power spectrum you give up low-end injector response, i.e. when you tip-in off idle, the injectors are running at minumum and can't modulate accurately enough, leaving a small hiccup. The issue's been tuned around, so I'm only getting a minor tip-in hiccup off a dead idle, instead of anytime I went off then back on the throttle, so it shouldn't effect me on track, and I don't really need a ton of driveability on that car. However, I'm probably ditching the BigMAF and possibly going to smaller injectors to lessen the issue.

Also, with all those bits and the tuning required for them, the ECUTek "fix" for the TGV delete CEL doesn't completely work... so I'm waiting on ECUTek to push a better fix that will work... unfortunately, they're all at SEMA this week.

2005-10-31, 10:21 AM	#4
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	I've got the TGV deletes on my car as well... but when you combine them with ported/polished WRX heads, an EJ257 shortblock, a GT30-10 turbo, Perrin FMIC, Perrin BigMAF, and 800cc injectors... well, you get some interesting results. Namely a tip-in throttle issue. I'm being told the tip-in issue is mostly caused by the MAF and the large injectors (though I bet the added flow of the TGV deletes and heads don't help). Essentially, to handle the high-end of the power spectrum you give up low-end injector response, i.e. when you tip-in off idle, the injectors are running at minumum and can't modulate accurately enough, leaving a small hiccup. The issue's been tuned around, so I'm only getting a minor tip-in hiccup off a dead idle, instead of anytime I went off then back on the throttle, so it shouldn't effect me on track, and I don't really need a ton of driveability on that car. However, I'm probably ditching the BigMAF and possibly going to smaller injectors to lessen the issue. Also, with all those bits and the tuning required for them, the ECUTek "fix" for the TGV delete CEL doesn't completely work... so I'm waiting on ECUTek to push a better fix that will work... unfortunately, they're all at SEMA this week. __________________ Is you is, or is you ain't, my con-stit-u-ints?