Timing, IAT's, 18psi and srt4 i/c :S - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-30-2009, 09:54 PM   #1
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Default Timing, IAT's, 18psi and srt4 i/c :S

Was doing alittle tuning last night, after checking out hustlers spark map I noticed his low end timing was more than mine and figured I'd give a few more degrees a try, our top end cells were almost identical and we are both running low comp motors and similar turbos (2871 vs 2860) so why not give a few more degrees a shot.

Everything went well but I noticed I had alittle knock at peak torque and 12-18psi (cells I changed were 2900-3400 and under 100kpa and fuel was added after aswell), so I checked my afr's, solid 11.5's, timing was 18*-20* from 3400-5700 and 183kpa to 230.

So after dropping a few points of timing and suppressing the kncok (now sitting at 16* from 3400-5700 @183kpa and 15* @ 212 and 14* @ 230) noticed a couple things;

1) My IAT's are rising from 70-80F to 90-105F in a single pull(as in the delta is approx 20F when I do a long pull)! This is in 16C weather at night, seems like way to much and I'm betting that is what's causing my det problems.

2) I can run 25-27 degrees of timing at 8psi in the same rpm cells and get no knock and I would expect to lower the timing as the boost rises but from 25 to 16 degrees for 4psi, seems extreme.

So I'm thinking my intercooler really is maxed out.

I just wanted to confirm this before my broke student *** spends any money.

Should I just ramp up more fuel ghetto tuner style? DC is sitting at 75% at 220kpa on my 750's

Or pick up one of those $100 intercooler from ebay (this is what I'm planning)



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-Dean

Last edited by dc2696; 08-31-2009 at 12:50 AM.
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Old 08-30-2009, 10:12 PM   #2
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Wi
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Old 08-30-2009, 10:38 PM   #3
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Wi
Thats last resort, if I have to run water to run this kind of timing I'm gonna flip.
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Old 08-31-2009, 12:42 AM   #4
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are your IATs rising from 80f TO 105f? or are they rising BY 80-105 degrees f? big difference and i'm not sure which one you mean.

the last time i was on the dyno i did two back to back pulls and my IAT went from 70-105 followed by 80-109. these were 4th gear pulls starting at low rpm with tall gearing (135mph by the end of 4th). also, the fan at this dyno left much to be desired.

by the end of the 1/4 mile i usually see temps around 120f, obviously the airflow through the intercooler is much better.

i'm running a cheap 3.5" thick front mount from ebay
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Old 08-31-2009, 12:45 AM   #5
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Lol they are rising from 80 or so to 100ish when I do a pull from low 3rd to the top of 4th gear.

So they are rising 15-20F on a two gear pull.

I guess that's normal??
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Old 08-31-2009, 12:53 AM   #6
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are your IATs rising from 80f TO 105f? or are they rising BY 80-105 degrees f? big difference and i'm not sure which one you mean.

the last time i was on the dyno i did two back to back pulls and my IAT went from 70-105 followed by 80-109. these were 4th gear pulls starting at low rpm with tall gearing (135mph by the end of 4th). also, the fan at this dyno left much to be desired.

by the end of the 1/4 mile i usually see temps around 120f, obviously the airflow through the intercooler is much better.

i'm running a cheap 3.5" thick front mount from ebay
Boost? Turbo? Motor? Timing?

Thanks man
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Old 08-31-2009, 01:16 AM   #7
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its that or get a bigger FMIC it seems to me you are undercapacity in the cooling department for your air intake. Or you got some bad gass.
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Old 08-31-2009, 10:45 AM   #8
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It looks like the FMIC is maxed. What turbine housing are you running?
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Old 08-31-2009, 07:11 PM   #9
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It looks like the FMIC is maxed. What turbine housing are you running?
Its the .64 housing so it is smaller than yours, and the srt4 i/c isn't very small btw but mayb its small enough to be ther problem
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Old 08-31-2009, 07:45 PM   #10
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The IC on my SRT4 is smaller than the one on my Miata. :P

From the looks of it, the SRT4's intercooler wasn't designed for max efficiency, it was designed to fit underneath the crash bar and to be cheap to manufacture.
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Old 09-01-2009, 10:56 AM   #11
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The IC on my SRT4 is smaller than the one on my Miata. :P

From the looks of it, the SRT4's intercooler wasn't designed for max efficiency, it was designed to fit underneath the crash bar and to be cheap to manufacture.
Werd werd.

But does anyone know what their IAT's are after doing a 4th gear pull?
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Old 09-05-2009, 01:45 PM   #12
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Just a quick follow up.

This morning ambient temps are hovering around 67F @100kph.

WOT pull from 3000 to 6000 (making 19psi) in third gear my temps hit 103F.

The i/c is definitely out matched, or I need a bigger turbo :P
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Old 09-05-2009, 02:10 PM   #13
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If you want to upgrade the IC but don't want to dick around with re-routing the piping, you could probably use any one of a number of SRT-specific intercooler upgrades. They make everything from stock-sized replacements to big monster coolers.
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Old 09-05-2009, 11:15 PM   #14
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Quote:
Originally Posted by kotomile View Post
If you want to upgrade the IC but don't want to dick around with re-routing the piping, you could probably use any one of a number of SRT-specific intercooler upgrades. They make everything from stock-sized replacements to big monster coolers.
I actually got that idea last night at a meet when an srt rolled up with some godly huge fmic.

Here's what I just bought.

2003-04 05 06 DODGE NEON SRT4 BOLT-ON TURBO INTERCOOLER:eBay Motors (item 190322308210 end time Sep-15-09 19:20:36 PDT)
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Old 09-05-2009, 11:25 PM   #15
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But does anyone know what their IAT's are after doing a 4th gear pull?
My intake temps start at 64F and rise to 78F after a 5th gear pull to redline.
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Old 09-05-2009, 11:28 PM   #16
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Ah that sounds better, thanks for the info Jay.
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