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Old 02-03-2007, 12:09 AM   #1
98-GT
Default 98 GT dyno numbers

I have a full pi swap, 75mm tb/plenum, underdrive pullies, catted h pipe and flowmaster catback. I ended up with 230 rwhp and 290 rwtq. Im happy with the torque especially since i got all of it by 3500 rpms but am dissapointed by the hp. The car seems to give out at 4500.
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Old 02-03-2007, 09:57 AM   #2
spike_africa
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auto or manual? regardless those numbers are low. But it doesnt matter. What matters is what it runs at the drag strip.

If it does feel like its crapping out could be a few things:
1-shitty tune
2- cam timing is off
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Old 02-03-2007, 08:35 PM   #3
98-GT
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its manual. the car feels fine driving its just on the dyno graph you can see that its really not making much power after 4500.
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Old 02-04-2007, 08:25 AM   #4
White04GT
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Well from what I've heard on the 96-98 GT's if you do a full pi swap you usually see nice gains and better numbers then the 99-04's..numbers seem low specially from the mods you have listed.
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Old 02-05-2007, 10:38 PM   #5
98-GT
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do u think i could be running out of fuel at high rpms? I no i dont need bigger injectors but maybe a stronger pump? Im not expecting it to give me much power but it sounds like it might help.
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Old 02-06-2007, 08:04 AM   #6
spike_africa
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did you get your a/f ratio logged? if so that would really tell you if fuel is a problem or not.
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Old 02-08-2007, 10:22 PM   #7
98-GT
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yea i did get my a/f, and it seems fine i guess fuel isnt a problem.
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Old 02-09-2007, 07:51 AM   #8
spike_africa
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If its not that only things i could think of are cam timing is off or shitty tune. Having the cam timing off ca cost you up to 20hp or more if its really bad. i mean there are alot of small things can make it happen.
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Old 02-09-2007, 05:48 PM   #9
98-GT
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if the cam timing was off would i notice it while driving, because the car seems to run fine to me but i might just be missing somthing.
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Old 02-28-2007, 02:43 PM   #10
r3dn3ck
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no... you wouldn't if they were retarded several degrees but otherwise in sync. I'll betcha your cams aren't timed correctly. You should be making like 20+ more hp minimum.
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Old 02-28-2007, 08:40 PM   #11
03gtmustang
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Post the graph if you can please.
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Old 02-28-2007, 08:44 PM   #12
98-GT
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ok i'll try to post it tomorow night. Also if the timing is off a bit would this damage the car at all?
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Old 03-01-2007, 07:12 AM   #13
spike_africa
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Yeah i would still say the cam timing would have to be off for such low numbers.
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Old 03-01-2007, 11:02 AM   #14
Wheat
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I'd like to see the graph, too. Stock PI engines typically peak the torque at 4000 RPM and power at 5000 RPM.
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Old 03-01-2007, 11:54 AM   #15
98-GT
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i should have the graph up tonight
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Old 03-07-2007, 02:25 PM   #16
03gtmustang
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Quote:
Originally Posted by 98-GT View Post
ok i'll try to post it tomorow night. Also if the timing is off a bit would this damage the car at all?
Could result in bent valves.
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Old 03-10-2007, 10:55 PM   #17
98-GT
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I finnally got to scan my dyno sheets, let me know what you guys think
Attached Images
File Type: jpg Ryans_dyno1.JPG (245.8 KB, 51 views)
File Type: jpg ryans_dyno_2.jpg (481.0 KB, 48 views)
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Old 03-10-2007, 11:02 PM   #18
98-GT
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I cant seem to get the right size of that first one ill try to post it up again later
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Old 03-11-2007, 08:05 AM   #19
spike_africa
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Thats one of the worst a/f ratios i have ever seen. It should run right under 13:1 for best n/a power.
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Old 03-11-2007, 09:22 AM   #20
r3dn3ck
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big bad lean until 4K rpm. That's a proper maf transfer function away from a much better performance. I'd be surprised if it's not pinging at 3500rpm.
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Old 03-11-2007, 06:33 PM   #21
jjtgiants
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Quote:
Originally Posted by spike_africa View Post
Thats one of the worst a/f ratios i have ever seen. It should run right under 13:1 for best n/a power.
I agree....could even run closer to 12:5 and bump up the timing
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Old 03-13-2007, 12:15 PM   #22
98-GT
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so is that a/f somthing mechanical or is that in the tuning?
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Old 03-13-2007, 01:07 PM   #23
r3dn3ck
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there's exactly 1 way to "properly" tune air fuel ratios. That's the MAF transfer function. You tinker with that with a custom tune.
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Old 03-13-2007, 09:31 PM   #24
03gtmustang
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http://forums.modulardepot.com/uploa...487d4a5cf6.jpg

Thats what your a/f should look like. Yours is terrible and thats why you're down on power. Find a new tuner.
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Old 03-14-2007, 10:48 AM   #25
r3dn3ck
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much better. Nice and smooth.
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Old 03-14-2007, 07:51 PM   #26
98-GT
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so you guys dont think its the cam timing anymore? and does anyone know of any good tuners in NJ? I know JDM engineering is supposed to be good but they only tune 01 and up mustangs.
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Old 03-15-2007, 10:40 AM   #27
Wheat
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Kevin@Wicked Motorsports is good; he's in Brick.
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Old 03-15-2007, 12:23 PM   #28
03gtmustang
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Matt Hill @ www.matthillmotorsports.com is good.
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Old 03-16-2007, 02:00 PM   #29
Wheat
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Quote:
Originally Posted by 03gtmustang View Post
Matt Hill @ www.matthillmotorsports.com is good.
Yes, add him in.
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Old 11-11-2007, 07:53 AM   #30
blueta
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I know this is an old post, but was that a/f AFTER a tune or was that just as you rolled it into the dyno?
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Old 11-11-2007, 07:53 AM
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