I noticed that between the vtec engagement point (2000GSR ecu) all the way to about 6500 rpm, there is a tremendous DEAD ZONE, where the engine feels like it's screaming, but is not going any faster... once 6500 hits, it just about flys thru vtec. Could this be a fueling problem ? Like too much fuel and not enough air ? I am just trying to get the 'stock' motor running correctly for what it is...

I had someone tell me their GSR has a 'dead zone' in that general area as well, but my 'zone' is ridiculously weak... almost feels like a bog !

I am running 9:1 CR with a GSR ecu obd2, no K/S.

X2

 

but you have an LS?

 

Ooooohhhh..... THAT's why my vtec never works !


There... I updated my signature... happy now ? I also have a book of mods I could list too... would that help someone answer the question ? (that part was sarcasm)


[Modified by X2BOARD, 2:30 PM 8/8/2002]


[Modified by X2BOARD, 2:31 PM 8/8/2002]

 

heh well i wasn't trying to imply anything, i was assuming you had done that but i wasn't sure, just clarifying =P

4 dr integras

 

anyway as for my GSR, i feel no dead zone in VTEC... although it does kick a lot more with the secondaries (maybe that's why yours feels weird... no secondaries... but im just guessing).

 

Well, I DO have a B16 IM, maybe that is helping the problem along... I know (or I think I do) that the lack of the GSR IM does not affect the ecu. The only thing I can really think is that the fact the B16 mani is short and fat, it kinda kills the lower end, but becomes more efficient in the upper band.

These are the factors against me:

1) LS tranny
2) B16 head/I.M
3) GSR 2K ecu
4) No K/S
5) (less than) 9:1 CR

I cannot change too much of this as the car is meant for turbo, just saving for a few new parts.

Could it just be a combo of the engine's shortcomings ? Or could the ecu be defective ? (got it on the net)

X2

 

Anyone else ?

 

get a VAFC and raise your VTEC x-over...

 

That doesn't really solve my problem on thw whole.... I would have to raise it to 6.5K to make use of the limited amount of vtec that actually makes power.... that's not exactly what I need.... but I still need a vafc anyways...

 

Uhh..ever thought that maybe your compression ratio is what is affecting it? VTEC thrives on higher compression. It almost seems like you're working against it. You've lowered the OEM ration by over a point..that's a very dramatic change. I don't think it's the ECU..but I strongly suggest that you get an APEX'i VAFC to get your air/fuel mix correct. Also..the LS transmission is definately slowing you down for now...the gear ratios are too far apart and you might even be falling out of VTEC when you shift. LS trans is better for turbo due to longer gearing(which I'm sure you already knew). You are right about the b16 intake mani..short fat sunners are good for top end but don't give as much low-end grunt. Another thing you need to find out is what degree your timing is set at..make sure it's not been retarded too much if it is..that will affect your top end power. That's all I can think of for now...hope this helps you!

 

yeah B18 vtec crossovers are set really low, most ppl raise it to about 5200-5800 area.

 

I understand that my lower CR and LS tranny is not the best all motor options.. but I built the motor for turbo, which, with the right paychecks... will be back on in a couple months... but for right now I am trying to get the car to perform correctly as an N/A setup... Understand that I do not expect to be laying 140whp or anything... I know this setup will be slow as N/A, but when driving, I can feel the motor holding back ! VTC-Civic drove the car the other day and he felt the 'holding back' as well.

There are still quite a few horses left uncovered that I need to figure out... Lets put it this way... with the LS ecu connected... in a race... I would prolly smoke the same car w/ the GSR ecu. Granted 9:1 is not exactly vtec heaven, but the motor should at least out perform a stock LS !

 

This is just a shot in the dark, but GOOD falconGSR told me in a different post he put an aem ems on a basically stock GSR. He found that there was a significant timing dip at VTEC crossover. I wonder if your problem is this just being multiplied by the lower compression. If you haven't advanced the timing you could try that. (I won't remind you to put it back for FI I know you know that) Again, just a thought...

 

Here's a stupid opinion but here goes..
You've got LS-VTEC with a b16 head and 2000GSR ecu right.. Well from what I understand..
- b16 pretty much has no low end torque right??
- GSR VTEC kicks in at around 4000 something RPM right?
- So how is a head with crappy low end power suppose to handle VTEC so early??
- If it was me and I had a VTEC Controller of some sort, I would find someone with a stock or near stock b16 and lower the VTEC point according to the GSR's engagement. From there you could probably see if the engines act the same with the VTEC engagement..
- Or better yet, just take your ECU and pop it into a car with a b16 and see if it runs the same..
- So in other words, I would tryTrial and Error, or better known as Guess and Check..

I know it's not the most technical and logical opinion but I hope it gives you food for thought..


[Modified by PnX-R, 10:45 PM 8/9/2002]