Using an N/A ecu in a TII
05-10-05, 02:59 PM
#1
Spending too much $$$
Thread Starter
iTrader: (3)
Join Date: Nov 2003
Location: wisconsin
Posts: 626
Likes: 0
Received 0 Likes
on
0 Posts
Using an N/A ecu in a TII
I recently swapped a TII engine into my car and it runs beautifully. It has an awsome idle and good compression. My problem is when I try to restart it when its hot. It doesn't. I have an s4 tII ecu in my car which is also a s4. It seems like the ecu is stuck in cold start. I thought if I unhook the battery that it would restart the ecu but that didnt do the trick. My question is would it be ok to put the n/a ecu back into the car? It would be like running a turbo on an n/a and plus with the n/a ecu the car starts just fine when its hot. I have an a/f gauge and safc so I can monitor and compensate for the fuel with the n/a ecu, but can I use it?
05-10-05, 07:53 PM
#3
Passing life by
Considering emishions are removed. The PS is different the MAF is larger you have a nock sensor and larger fule map a PS on the elbo Twin scroll silinoid.
So far you have the fule coverd MAF is interchangeable PS is swapable. That leaves the nock sensor the sensor on the elbo and the twin scroll. If you work thows out then in theory it should work I say stand alone if you can. However I do not know for a fact.
So far you have the fule coverd MAF is interchangeable PS is swapable. That leaves the nock sensor the sensor on the elbo and the twin scroll. If you work thows out then in theory it should work I say stand alone if you can. However I do not know for a fact.
05-10-05, 08:01 PM
#4
Super Raterhater
iTrader: (6)
Join Date: Dec 2001
Location: NY, MA, MI, OR, TX, and now LA or AZ!
Posts: 10,627
Likes: 0
Received 2 Likes
on
2 Posts
LOL. The ECU isn't your problem, it's old dirty injectors and probably low compression. You have the standard hot start issues common on even N/A's. Don't touch the ECU, get your injectors cleaned and check your compression.
05-10-05, 09:07 PM
#5
Spending too much $$$
Thread Starter
iTrader: (3)
Join Date: Nov 2003
Location: wisconsin
Posts: 626
Likes: 0
Received 0 Likes
on
0 Posts
I thought it was my injectors at first also. I put the N/A ecu into the car tonite and there is no problem starting it up when its hot. Also the compression on the car is fine.
05-10-05, 09:41 PM
#6
You cant run that TII with that N/A ECU, but you CAN start it.
And for clarification, the hot start CAN be caused by the ECU.
Oh, and more likely, you have a sensor that is causing the ECU to hot start. Our ECUs are dummies, they dont remember **** (kinda like me after a good night on tequila). Once you turn the car off, the ECU has just dumped anything it had (which wasnt much to start with).
Rat
And for clarification, the hot start CAN be caused by the ECU.
Oh, and more likely, you have a sensor that is causing the ECU to hot start. Our ECUs are dummies, they dont remember **** (kinda like me after a good night on tequila). Once you turn the car off, the ECU has just dumped anything it had (which wasnt much to start with).
Rat
Last edited by J-Rat; 05-10-05 at 09:52 PM.
Trending Topics
05-10-05, 09:53 PM
#8
Passing life by
Originally Posted by J-Rat
You cant run that TII with that N/A ECU, but you CAN start it.
Originally Posted by J-Rat
And for clarification, the hot start CAN be caused by the ECU.
05-10-05, 09:54 PM
#9
Oh, and more likely, you have a sensor that is causing the ECU to hot start. Our ECUs are dummies, they dont remember **** (kinda like me after a good night on tequila). Once you turn the car off, the ECU has just dumped anything it had (which wasnt much to start with).
Rat
Rat
05-11-05, 01:27 AM
#12
Passing life by
Originally Posted by red_ricer
It is an s5 engine in an s4 shell.
05-11-05, 03:30 AM
#15
BOOSTED Vert
Join Date: Sep 2002
Location: Miami
Posts: 2,307
Likes: 0
Received 0 Likes
on
0 Posts
I ran my stock vert ecu for a bit and it ran just fine. Idled great and boosted just perfect.. The only thing was that it ran a lil rich using the 550's and didnt have good fuel economy. But I got haltech now. So yes you can use the n/a ecu.
05-11-05, 03:44 AM
#16
Super Raterhater
iTrader: (6)
Join Date: Dec 2001
Location: NY, MA, MI, OR, TX, and now LA or AZ!
Posts: 10,627
Likes: 0
Received 2 Likes
on
2 Posts
The vert ECU is the 'special' case where it can generally do both just fine (for the s4's), however, all other ECU's should not be swapped, though they might function to some extent. It's just a plain bad idea.
05-11-05, 10:52 AM
#21
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 22 Likes
on
20 Posts
Originally Posted by SonicRaT
How about LHTD Mr.Rat. I bet it won't take long for you to figure that one out. 
You two need to join the military service and learn some discipline! humor
05-11-05, 10:59 AM
#22
Spending too much $$$
Thread Starter
iTrader: (3)
Join Date: Nov 2003
Location: wisconsin
Posts: 626
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by iceblue
How are u doing this with an S4 ECU? u have to double check the impedianc on your injectors as well the S5 has a nock sensor built into the ECU where the S4 has a stand alone computer for that as well the ECU is exspecting a electric OMP and if im not mistaking that will cause it to go into limp mode without this but maybe not since its a s4 on s5 and not other way around but your engin should allso have 2tps's where s4's have 1
I used all of the S4 electronics basically. I used 1 tps on the throttle body and instead of switching front covers I decided to just run premix. As for the knock sensor I just ran the single wire from the sensor to the box itself. Also as for the injectors I just used low impedance 550's primary and 720's secondary. If I wanted to run the high impedance S5 TII injectors I could have just removed the resistor pack.
05-11-05, 12:52 PM
#23
Passing life by
Originally Posted by red_ricer
I used all of the S4 electronics basically. I used 1 tps on the throttle body and instead of switching front covers I decided to just run premix. As for the knock sensor I just ran the single wire from the sensor to the box itself. Also as for the injectors I just used low impedance 550's primary and 720's secondary. If I wanted to run the high impedance S5 TII injectors I could have just removed the resistor pack.
05-11-05, 06:43 PM
#25
Senior Member
Join Date: Jun 2004
Location: Canada
Posts: 442
Likes: 0
Received 0 Likes
on
0 Posts
I had my tII engine running on a NA ecu for over a year @10psi and still going. I agree it is not the best solution but that is all I had. But it worked much better with the NA ecu than the turbo ecu. It was smoother and more bottom end pull.