Got a speedo problem....help.....
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TECH Senior Member
Joined: Nov 2001
Posts: 11,603
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From: Chi-Town, IL
Got a speedo problem....help..... I recently had a TH400 conversion done to my car and the speedo didn't work afterwards, then the shop that did it for me ordered the Yank speedo sensor thing which solved the problem, yesterday the car was on the dyno w/out tuning and made some impressive #'s....then the tuner (BV performance) put in the program after the car was off the dyno...I took the car and was ready to go home, but as soon as I got on the road I noticed I was a lot of MPH slow...so I went back, the tuner put in a bunch of different gear selections and nothing was working...I have 3.73's in the rear by the way......
Any ideas on whats going on with this?? Any way to solve this, I had a speedo calibrator in the car originally for the 4.10's befor, but it was taken out prior...Izzo said that as a last resort we could always put it back in and it would work fine with the new setup...
I am going back Saturday to mess with it some more to see if we can solve this problem...any things I should let the tuner know that might solve this problem??
Thanks,
Bos
Any ideas on whats going on with this?? Any way to solve this, I had a speedo calibrator in the car originally for the 4.10's befor, but it was taken out prior...Izzo said that as a last resort we could always put it back in and it would work fine with the new setup...
I am going back Saturday to mess with it some more to see if we can solve this problem...any things I should let the tuner know that might solve this problem??
Thanks,
Bos
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Joined: Nov 2001
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From: Illinois
Re: Got a speedo problem....help..... what do you mean you made impressive numbers...last I RECALL you had more hp before you did all those mods.....makes you wonder.... <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
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From: Chi-Town, IL
Re: Got a speedo problem....help..... Greg, you are supposed to lose around 30rwhp with a TH400...everyone has...I made 360rwhp and 346rwtq with the 6-speed tranny and that was with no programming and no "free mods"...now I have a TH400 with a 4500 stall (non-locking) it made 353rwhp & 380rwtq...that IS impressive...I lost 7rwhp from the total conversion....the TH400 is probably above a 25-30% drivetrain loss, the 4l60e is about 20% loss...I figure if I still had the 6-speed tranny I would be making around 385rwhp...and thats still with stock heads... <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
