89 with 99 sho motor. ( crossposted in 89)

[Paul harrison]

All right guys I’ve posted on the SHO Facebook site with some help but I still need more I’ve been suggested to post on this website. I’m posting in the first GEN because the car is a first GEN Sho however I bought this car with a 1999 sho Motor.
The car was not running when I bought it however most of the work had previously been done and I believe on the previous owners information it was running at one point. I worked on the fuel system and got the car running within a few days. The car now runs however it will not ever read of above 5200 RPM. The car is running the original five speed from the 89 with an adaptor plate to the 1999 motor
After dealing with a heck of a lot of wiring left over from the swap I have narrowed down and found my range sensor wires well at least some of them in my neutral safety plug. As you’ll see from the photo it’s been quite the endeavour figuring out what the previous owner did
I have located the range sensor is well as the neutral safety switch because I am thinking that the car thinks it’s in neutral and will not wrap over 5200 in any gears. I’m looking to resolve this I’m looking to know if anybody else has done this V-8 swap with the five speed and how they tricked the computer.

Any help is greatly appreciated

 

[Paul harrison]

Any help is greatly appreciated[/QUOTE]
ry guys I keep saying the gen one is a 89. Force of habit. My old one was a 89. This is a 91

 

[gamefanatic]

Well, you may be right, thinking you are reaching a neutral stall. It's been a few Sunday's since I have looked at the Max RPM's set on the computer for that.
I imagine this is running a Gen3 computer? Do you have access to the tuner for it? I'm curious what they did to it to deal with knowing what gear it's in and the fact that it can't control the shifts. Seems like these would throw codes. Is there a piggy-back computer for the tranny?

 

[Paul harrison]

Well, you may be right, thinking you are reaching a neutral stall. It's been a few Sunday's since I have looked at the Max RPM's set on the computer for that.
I imagine this is running a Gen3 computer? Do you have access to the tuner for it? I'm curious what they did to it to deal with knowing what gear it's in and the fact that it can't control the shifts. Seems like these would throw codes. Is there a piggy-back computer for the tranny?

Here is the fun part. Looks like it has one Ecuador’s located in passenger firewall. I’m going to dig more into it tomorrow. The neutral safety is also not connected. 1-5 all max at 5200.
And mysteriously half the range selector wires are MIa. I found light grey and red and light blue and yellow both Ecu related.

Car runs great now. It no vroom vroom past 5200 lol
I’ll up date the thread tomorrow

 

[gamefanatic]

Yeah, definitely see what's going on to provide feedback to the computer what gear you are in. Sounds like it only knows neutral.

 

[E1]

Neutral rev limit on Gen 3's is 3400 rpms. I do not think the 5200 limit has anything to do with this limit.
Scott K - Venom on here, did a gray 96 with a Mazda tranny I believe.

He is still active on the V8SHO.com email list but I rarely see him chime in over here.

 

[GEN 3 SHO FAN]

Yes the limit is between 3400 and 4000 rpm. Any gen 3 owner can test it in park giving gas to car. (It's a little upper of 3400 because you can also make a check up to see if IMRC opens the secondaries).

Can it be related to some infos rode by the ECU, by some gen 1 sensors maybe (which still on the car) ?

I'm wondering if there is something on manual tranny for Gen 3 on V8SHO... I have a very far souvenir about something on that IIRC. (more than a light "how to" than a problem solver though)

 

[Paul harrison]

Neutral rev limit on Gen 3's is 3400 rpms. I do not think the 5200 limit has anything to do with this limit.
Scott K - Venom on here, did a gray 96 with a Mazda tranny I believe.

He is still active on the V8SHO.com email list but I rarely see him chime in over here.

 

[Paul harrison]

Well that’s interesting. My rev limit is 5200 in ALL gears and neutral Maybe my assuming are wrong and I have a different issue ? I’ll be digging the ecu out today This will give me idea what I’m dealing with.

 

[GEN 3 SHO FAN]

Is the ECU is stock or some modifications have been made on it ?

 

[Paul harrison]

Yes the limit is between 3400 and 4000 rpm. Any gen 3 owner can test it in park giving gas to car. (It's a little upper of 3400 because you can also make a check up to see if IMRC opens the secondaries).

Can it be related to some infos rode by the ECU, by some gen 1 sensors maybe (which still on the car) ?

I'm wondering if there is something on manual tranny for Gen 3 on V8SHO... I have a very far souvenir about something on that IIRC. (more than a light "how to" than a problem solver though)

Guys I’m pulling the ecu today will report back

 

[gamefanatic]

That's the thing, even if its a stock ecu, it could have been flashed, but hopefully its a piggyback system..