Question about Si trim - MustangForums.com



Pipes, Boost & Juice Talk about Exhaust, Nitrous, Blowers, Turbos, Superchargers... whatever makes you go faster!
Sponsored by:
Sponsored by:

Reply
 
 
 
Thread Tools Search this Thread
Old 09-28-2012, 10:41 PM   #1
Bman2000
4th Gear Member
Thread Starter
 
Join Date: Apr 2009
Location: oregon
Posts: 1,501
Default Question about Si trim

So got everything installed, made my butt *** ugly power pipe lol. i have a 3.33 pullie on my Si trim v1 so i had a few questions. How quickly are people building boost with stock hci? I ask because ive been flogging it a bit in the lower rpm, and at about 4-4500 i make 6psi WOT, so since its not tuned yet (before you flame me for railing an untuned car, i had it tuned on a dyno with the intent of it making 10psi but turned out my s trim was bad so the tune stayed in the car, but i upgraded the sc. thats why im only flogging low rpm not high yet. my af is safe at 11.5) Back to question at hand, is boost a linear thing? like if i started building boost at 3500, and make 6 psi at 4500 would it be accurate to assume 12psi at 5500? im just trying to get an idea of what ill make, cuz its killing me waiting for this dyno time to roll around. Plus i kinda thought the power pipe and s trim woul make a 3.33 pullie have at least 12psi, and i just dont feel like it would get there with the little tooling around that ive had... Plus im hoping that it pulls way harder above 5k because at 4500 just feels like its ok fast, not real fast. i think im just being deprived of my need for speed right now with this short shift stuff. If anyone can give me insight thatd be great.
Bman2000 is offline   Reply With Quote
Old 01-23-2013, 02:35 AM   #2
89blackonblack
2nd Gear Member
 
89blackonblack's Avatar
 
Join Date: Apr 2007
Location: connecticut
Posts: 199
Default

i know this is an old post but did u ever get it on the dyno?
89blackonblack is offline   Reply With Quote
Old 01-23-2013, 09:22 PM   #3
Bman2000
4th Gear Member
Thread Starter
 
Join Date: Apr 2009
Location: oregon
Posts: 1,501
Default

...sort of? lol after i had it rebuilt to si trim, it actually built boost, only made 8.25@6k which seems low for a 3.33 w/ a power pipe and whats supposed to be a 2psi max loss@600hp fmic....but it is what it is. I only put down 337 no timing because i had fuel delivery issues up top, peaked rich at 5300 (10.5afr) when it had been running solid 11.5afr then 5500 fell on its face and leaned out. And i ran out of money, so ive been slowly trying to diag it, but seems the like fuel pressure rail sensor is still good, and the fpdm tested bad, but i dont like how they had me test it so im looking into that more. Ill probably bring it out with some snap on test equipment attached and try to get a better answer. But at this point im sick of this fuel system and im halfway saved for a return style stealth swap from glens
Bman2000 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Win $1500 Worth of RTR Parts - AmericanMuscle AMAlexLazarus AmericanMuscle.com 3 10-02-2015 08:06 AM
Hot Lap: 2015 Roush RS3 Test + Build a Supercharger! - AmericanMuscle.com AMAlexLazarus AmericanMuscle.com 0 10-01-2015 09:21 AM
4 Valve Head questions GimpyHSHS 4.6L (1996-2004 Modular) Mustang 6 10-01-2015 09:01 AM
Colgan Custom Bra for 2014 Mustang mdg Parts For Sale 0 10-01-2015 07:04 AM
Hello, new user with an older Mustang and a question treesloth New Member Area 4 09-28-2015 07:03 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 09:11 PM.