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Old 09-29-2001, 11:49 PM   #1
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Exclamation Changing the stock cams. What about the ECU?

Hey....
I was just wondering
do we need to remap the ecu if we change the stock cams to the JWT cams?
or even change it back to the 91 SR20DE cams?
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Old 09-30-2001, 04:11 PM   #2
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Re: Changing the stock cams. What about the ECU?

Quote:
Originally posted by pche059
Hey....
I was just wondering
do we need to remap the ecu if we change the stock cams to the JWT cams?
or even change it back to the 91 SR20DE cams?
You do not need to remap the ECU to run JWT cams. However, JWT does have programs available that will optimize the the performance with the cams. Mostly they change the spark map. I don't know the details since it's proprietary information, but I know that those who do know say that at certain rpms they add or subtract spark advance. The cams are very efficient at cylinder filling and that results in the opportunity for optimization of the maps.

They can also change some things to smooth out the idle.

Otherwise, a stock ECU/MAF will yield excellent results and will adapt well to the cams.
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Old 09-30-2001, 05:10 PM   #3
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I was thinking of gettin cams but my friends told me that using aftermarket in an automatic doesn't do jack.. It is only good for manual....anyone can confirm this??? IM out!
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Old 09-30-2001, 06:35 PM   #4
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well then if i change the cam
could the red line be pushed back a little bit later then?
according to my S AFC my engine cuts off about 6800 rpm....that's a bit low for a N/A car.....

and what controls the rev cut of the engine? is it the ecu ...? or some hardware devices?


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Old 09-30-2001, 11:53 PM   #5
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Quote:
Originally posted by pche059
well then if i change the cam
could the red line be pushed back a little bit later then?
according to my S AFC my engine cuts off about 6800 rpm....that's a bit low for a N/A car.....

and what controls the rev cut of the engine? is it the ecu ...? or some hardware devices?


The solid rocker SR20 will rev to 7850 rpm safely, but that is independent of the cams used. The revs are limited by the hydraulic valve lash asjusters (HVLAs). Over 7850 the HVLAs are not able to keep the rockers in constant contact with the cams and they eventually (quickly) spit out from under the cams. At best this just means having to put it all back together. At worst it could lead to bent valves and buggered cams.

If you have a roller rocker engine, I'm not sure what the limit is. It's probably the same, but I don't know for sure.

The rev limit is controlled by the ECU and is handled by cutting the fuel. It can be rather dramatic in the SR20. The first time I hit it I thought I blew the engine. Last time I hit it was in the SE-R race car. Oops. I totally lost touch with what I was doing. Thank God for the rev limiter.
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Old 09-30-2001, 11:54 PM   #6
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Quote:
Originally posted by Shobo
I was thinking of gettin cams but my friends told me that using aftermarket in an automatic doesn't do jack.. It is only good for manual....anyone can confirm this??? IM out!
Your friends don't know what they are talking about.
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Old 10-01-2001, 01:53 AM   #7
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Old 10-01-2001, 05:32 AM   #8
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yes i think my SR20 is the roller rocker one
JWT is apparently designing a set of cams for us


Quote:
The rev limit is controlled by the ECU and is handled by cutting the fuel. It can be rather dramatic in the SR20.
does this mean that i should probably remap my ecu/ or even change it since my ecu cuts my fuel supply at around 6800rpm...which i really do hate
7850 and 6800 is a huge difference...esp for NA cars where you get your horse power from high reving
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Old 10-01-2001, 06:52 AM   #9
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Quote:
Originally posted by pche059
yes i think my SR20 is the roller rocker one
JWT is apparently designing a set of cams for us

does this mean that i should probably remap my ecu/ or even change it since my ecu cuts my fuel supply at around 6800rpm...which i really do hate 7850 and 6800 is a huge difference...esp for NA cars where you get your horse power from high reving
I don't blame you for hating the 6800 rpm redline. It's lame. The SR20 loves to rev. I would send an e-mail to JWT and ask if the roller rocker engine can be safely reved to 7850 rpm. If you don't get a reply, let me know and I'll get the correct information to you.
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Old 10-01-2001, 06:57 AM   #10
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what's their website URL and what's their email address?
:P
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Old 10-01-2001, 07:05 AM   #11
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Quote:
Originally posted by pche059
what's their website URL and what's their email address?
:P
http://www.jimwolftechnology.com the email is on the web page.
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Old 10-02-2001, 11:10 PM   #12
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P10DET : I am not getting any reply from JWT..... so if you could please find out form me it would be grealy appreciated
thx man
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Old 10-02-2001, 11:22 PM   #13
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Quote:
Originally posted by pche059
P10DET : I am not getting any reply from JWT..... so if you could please find out form me it would be grealy appreciated
thx man
You bet.

Give me a little time.
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Old 10-02-2001, 11:44 PM   #14
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So far JWT has not tested it above the 6900 rpm stock redline.

Hmmm. Sorry to get your hopes up.

A 7850 rpm redline is so cool.
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Old 10-02-2001, 11:54 PM   #15
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haha damn
well thx alot man... gosh you are quick too
hey is it worthwhile to get the cams done on an auto G20?
the kinda gear ratio you have on an auto requires a rather wide powerband to get the car really moving ....am i right?
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