Open trumpet ms3 s52 vs obd1 epic off the shelf tune

[TheAxiom]

I hate to say I told you so - but all of that for an extra 5wtq, and down 30whp from similar S52s.

[richardkeith97]

Car is currently at the tuner. Derek Burton is tuning it. This is the Dyno run with the outerwear shitty prefilters. No more dip. Looks promising. Going to do a run without filters and with itg filters that I removed all the oil from. I will be back here with the results .

[richardkeith97]

Back to the Dyno for a week may 14th. 3 different filters. See what happens

[richardkeith97]

Filters should be 3-4x the area of the opening of the trumpet and at least 2" away from the front also

[richardkeith97]

Yes. My outerwear filters we're not flowing enough air. Their was a vacuum at 4k. I got some pipercross and itg's coming in the mail. Then have to make an appointment to have retuned :( pain in the ass. Live and learn I guess. I thought the outerwear filters wouldn't be restrictive. Didn't do my homework on them.

[TheAxiom]

Any update OP?

[brads2002]

Thanks. Good luck on April 23rd.

[richardkeith97]

Curious do they do OBD 1 tuning at this shop? I am up the road from them. Headers and a schrick cams on my motor but otherwise similar.

Has to be on megasquirt

[brads2002]

Curious do they do OBD 1 tuning at this shop? I am up the road from them. Headers and a schrick cams on my motor but otherwise similar.

[richardkeith97]

Well I guess I'll find out april 23rd. My tunes weren't made for this type of cam adjustment. So an off the shelf tune isn't really a good example. If I'm not happy with the results from the Dyno tune I'll get the cams fixed. I'll report bFk here with the results

[TheAxiom]

Stock S52 tuned (S52 manifold)



Sam car as above tuned with a M50 manifold now:



With Exhaust tuned


(different car?)
Stock S52 w/ M50 manifold tuned



You're asking people how to work around your cam timing, and that's just not the way to do it.

[TheAxiom]

I like the car like this . It's a street car. With the cams timed correctly I won't make the same amount of torque at 3k

Yeah, it probably will. Having the cams timed wrong doesn't mean you gain 50lb-ft because you're loosing 50whp. It could mean you're losing 20whp for 5lb-ft of torque.

https://www.r3vlimited.com/board/showthread.php?t=327183

You either want to do it right, or you don't, its entirely possible to make the same or more torque you have down low and more power up top

[richardkeith97]

Or, could just time the cams correctly.

Most of the people who have low/less torque are because they aren't tuned or are running crazy/silly exhausts.

I like the car like this . It's a street car. With the cams timed correctly I won't make the same amount of torque at 3k

[TheAxiom]

Ok so when I put my itbs on I popped the valve cover off. I have an s52 with s52 cams. The cams are installed with less overlap. Giving me more low end torque. Losing a little hp up top. My vanos needs to be shut off earlier to compensate for this. My off the shelf tune is obviously not for this setup .will be tuned on megasquirt April 23rd

Or, could just time the cams correctly.

Most of the people who have low/less torque are because they aren't tuned or are running crazy/silly exhausts.

[richardkeith97]

Ok so when I put my itbs on I popped the valve cover off. I have an s52 with s52 cams. The cams are installed with less overlap. Giving me more low end torque. Losing a little hp up top. My vanos needs to be shut off earlier to compensate for this. My off the shelf tune is obviously not for this setup .will be tuned on megasquirt April 23rd