I agree that the correction factors are a little screwy sometimes, but we atleast need to know if the conditions were similiar between the before and after runs. My corrected 14.9@94mph for 1100 above sea level, 75% humidity, 80 degrees, and a 29.91 baropressure comes out to be about a 14.4@97mph with a 2.4 60 foot. So....if I had a 2.1 60 foot, does that mean I have a high 13 second car...I don't think so. It sure would be nice though

Dave

 

Below is the dyno of the 95 JWT ECU vs the 97 ECU done by biomax. He also has the hp/tq curves in an excel chart but since I don't excel I can't view them . I should also point out that he had 2 programs that JWT sent him. I should also point out that in other nissan's the JWT ECU is conservative too. I seen instants were others would use a S-AFC to fine tune the ECU and pick up some power. however a replace for it, it is not.

 

After looking at Biomax's runs, it looks as if he's gaining approximately 5 fwhp and 7 ft/lbs of torque thru the rpm range. This corresponds very nicely with Chebostos dyno. What were Biomax's mods at the time? Didn't Biomax say the JWT was pretty much worthless for the price?

Dave

 

Biomax had stillen intake, SS Y pipe, RT cat, Greddy exhaust. His car is very consistant he has like 8 other dyno runs to his credit. Like 95 ECU vs 97 ECU, MAF w/o screens. The thing is He paid $570 for the JWT ECU and I believe $100 for the 2nd program. I don't think Biomax has ever been to the strip but he is a bad *** driver on the autoX. Also you can see there is virtually no power gain above 5000rpm, since his car was above 5k on the autoX. It wasn't much use for him aside from the higher rev limiter. But for auto equiped maxima's this mod should be done. For one thing the auto will always drop back to 4000-4400rpm on each redline shift. This would put the car right at that torque peak the JWT/UPRD ECU's provide. Last year when we did our group dyno we had 2 stock 97se auto's and a 95se auto. While the 97's were basically the same, the 95 had 1-4lb-ft more torque and the power curve didn't fall until 6000rpm. Where as both the 97's fell off at 5800rpm, so basically the 95 had "more area under the curve".

 

[/QUOTE]
But for auto equiped maxima's this mod should be done. For one thing the auto will always drop back to 4000-4400rpm on each redline shift. This would put the car right at that torque peak the JWT/UPRD ECU's provide. Last year when we did our group dyno we had 2 stock 97se auto's and a 95se auto. While the 97's were basically the same, the 95 had 1-4lb-ft more torque and the power curve didn't fall until 6000rpm. Where as both the 97's fell off at 5800rpm, so basically the 95 had "more area under the curve". [/I][/QUOTE]

So should my 96 auto with a 96 UPRD ECU actually benefit more than a 96 5spd with the same mod???

 

But for auto equiped maxima's this mod should be done. For one thing the auto will always drop back to 4000-4400rpm on each redline shift. This would put the car right at that torque peak the JWT/UPRD ECU's provide. Last year when we did our group dyno we had 2 stock 97se auto's and a 95se auto. While the 97's were basically the same, the 95 had 1-4lb-ft more torque and the power curve didn't fall until 6000rpm. Where as both the 97's fell off at 5800rpm, so basically the 95 had "more area under the curve". [/QUOTE]

So should my 96 auto with a 96 UPRD ECU actually benefit more than a 96 5spd with the same mod??? [/I][/QUOTE]
I would say it should, the reason being is the gearing. Basically the auto due to its taller gearing will have more "area" of the powerband than the 5spd will. Since both ECU's have very good torque gains throught the midrange you will notice it.

 

The really odd thing is that the shape of Cheston's UPRD ECU torque curve looks EXACTLY like my stock 97-ECU'd torque curve. Where's the beef?

Here's another thing to point out for Cheston and Nabil's argument...I have NEVER thought that swapping an ECU then dynoing is a good idea. Every time you do that you reset the ECU. The ECU will NOT run optimally when first installed. It will take some time to adjust. I have always noticed this with my car. I suspected this with Biomax's dyno as well as Cheston's here. I'd like to see a dyno of a UPRD ECU'd car after the ECU has been in the car for a week or two. I bet you'll see some significant mid and lower range torque gains that weren't there with a newly-installed ECU.

 

Just to give you some insight into the dyno regarding what gear is proper to dyno in. When they tune my program they use a clayton in order to get the most accurate reading. in fact, at the two seperate tuners that I have used they said that they clayton is far more accurate than a Dynojet. When they run the dyno for me they USE 3RD GEAR. They do not use fourth gear for they feel that third gear will give them the most accurate guage of the true numbers. Dont ask me why, however this is the way they do it for all of their cars. My first tuner was a performance BMW tuner, and my present tuner is Technodyne, specializing in Porsches. They use only third gear for all cars.

 

You know that is a good point. But again Biomax did extensive testing. His first runs were with the JWT ECU then with stock 97 ECU. I remember him telling me that the torque gain in the midrange and lowend was very noticeable. So I figure his car probably would have adjusted to the JWT ECU since he used it for daily driving. Now it didn't do him much good on the AutoX because his car stays in the 5100-7100rpm range during the runs. However for drag racing it would definitly help. The gain in torque is enough to drop the 60ft by around 1-1.5 tenths. In drag racing the general rule of thumb is for every 1 tenth dropped in 60ft, drops 2 tenths in ET with the same trapspeed. Also I figure the ECU is the same price as B-pipe and/or catback, with way more gain and no noise. Of course it would help more if Hocus Pocus would use a different dyno chart like the other dyno shops do. Its kinda confusing to look at IMHO.

 

Agreed! I wouldnt mind saying that about my Max either!

 

I thoght about this too, and yes I have seen my car perform better after my ECU gets use to my mods. However, doesn't the ECU go into a closed loop program at WOT, so wouldn't the gains be on slight if any???

 

hmm

 

[sprint at home]

dig dig dig dig dig dig dig-

"Hmm this old a$$ thread will do nicely"

reply

[/sprint at home]

 

 

hmmm?? hmmm

 

wow. you actually think? amazing .. maybe you should post something GOOD.

 

 

visit the 4th Gen Forum once in a while.. maybe you will actually learn to contribute information

 

Methinks this will be locked soon... IBTL

 

I think I got lost... Why was this old thread brought back up anyway??

 

Don't you mean open-loop at WOT?

 

Not sure what I meant that day, but sure?? LOL

Actually what I meant was I thought at WOT our ECU had a predetermined program that it ran??