Fred931 Posted September 25, 2012 Report Share Posted September 25, 2012 First: I want to get a sense of how much power my TGP is making. As far as I know, there is not a shop with a dyno within HOURS of Mobile, AL, so I can't figure out that way. I know my mods (flybynite stage II tune, K&N filter, 19# injectors) and a couple runs (9.07@67MPH and 9.63@69MPH). I used calculators on the latter, but the range is as great as 160-240HP. Also, I want to replace the stock mufflers. I don't understand how to measure exhaust pipe between inside and outside diameter, so I don't know what size inlets/outlets to get. It also even seems like the pipes get smaller after the split to the twin exhaust tips. Two questions in one: What is the size (or how can I figure out with just a tape measure), and can I just use one muffler before the pipes split, replacing the originals with just pipe, or do I need to get two, one for each side? I've asked on the TGP site but it's just d-e-d-dead. Quote Link to comment Share on other sites More sharing options...
Garrett Powered Posted September 25, 2012 Report Share Posted September 25, 2012 I got a 3.4 DOHC car exhaust on my 88. I believe the previous owner said it was a direct swap. 2.5 instead of 2.25. Quote Link to comment Share on other sites More sharing options...
redgrandprix Posted September 26, 2012 Report Share Posted September 26, 2012 exhaust size on mine is 2 1/4 to 2 inch after the y, if you want to put a muffler before the split it needs to be a glasspack or similar size, i have 2 street strip summit mufflers and they sound pretty nice but i'm also in a similar conflict, a caliper is needed to measure the pipe accuratly Quote Link to comment Share on other sites More sharing options...
skitchin Posted September 26, 2012 Report Share Posted September 26, 2012 Hmm, wonder how raspy a glass pack in place of the cat would sound(Header muffler style). Quote Link to comment Share on other sites More sharing options...
Fred931 Posted September 26, 2012 Author Report Share Posted September 26, 2012 exhaust size on mine is 2 1/4 to 2 inch after the y, if you want to put a muffler before the split it needs to be a glasspack or similar size, i have 2 street strip summit mufflers and they sound pretty nice but i'm also in a similar conflict, a caliper is needed to measure the pipe accuratly So, when I order a muffler(s), do I want to order it with the openings 2 1/4 or 2 inches as-listed in the description of the part? Or do I need to figure the proper size inlets to get based on some math? I don't see why it wouldn't be the former. Also, say I put one muffler before the split. I would need 2" inside-diameter pipe to replace the stock mufflers, right? I think in the future, I will swap the catback to 2.5". For now, I'm just kinda about the noise. This forum is also so much faster than TGPForums and I'm not surprised, since this one discusses more than two very lonely models. Quote Link to comment Share on other sites More sharing options...
redgrandprix Posted September 26, 2012 Report Share Posted September 26, 2012 i say get a caliper and start measuring, but your piping is 2 1/4 inch and 2 inch O.D. or atleast thats what mine measured with a caliper Quote Link to comment Share on other sites More sharing options...
Fred931 Posted September 30, 2012 Author Report Share Posted September 30, 2012 Got more information and a good idea of what to do from Adam. Thanks to him. So can anyone estimate how much power I am making? Here's the full timeslip from that run: Reac: +.337660: 2.1536 330: 6.1349 ET @ 594ft: 8.3996 1/8 E/T: 9.07 MPH: 67.05 The top of the receipt: MOBILE DRAGWAY | "WORLDS GREATEST DRAGSTRIP" Someone on TGPF said 230-240 is reasonable. I will also go back to the track this coming Friday to hopefully get a better run (harness flew off that time, probably didn't help the time) Quote Link to comment Share on other sites More sharing options...
skitchin Posted September 30, 2012 Report Share Posted September 30, 2012 Got more information and a good idea of what to do from Adam. Thanks to him. So can anyone estimate how much power I am making? Here's the full timeslip from that run: Someone on TGPF said 230-240 is reasonable. I will also go back to the track this coming Friday to hopefully get a better run (harness flew off that time, probably didn't help the time) Hard to judge being that all you have are 1/8th mile times - but comparing them to other W-body and grand prix times, I'd guess around 210HP +/- 5HP at the crank. Would be curious to see your 1/4 mile times, but based on my comparisons, you're probably in the range of 13.9-14.5. Of course, there's a lot of variables here, biggest one being the driver. Having compared track slips, I'm kind of surprised you're getting 9's though with that slow(no offense) of a trap speed - must be getting her out of the hole pretty quickly. Quote Link to comment Share on other sites More sharing options...
Fred931 Posted September 30, 2012 Author Report Share Posted September 30, 2012 (edited) Nearest 1/4 is in Gulfport, about two and a half hours away. The ones in Atmore and Pensacola (both still a helluva stretch) were 1/4 mile's but ran out of money and shut down within the last few years. My first run was a 9.6-something but with a trap of 70MPH flat. I run Cooper Zeon RS3-A tires based on they last much longer than a lot of tires in the original size, but they are actually very, very good tires overall. I am also a whopping 130lbs, and I left the spare and tools in my dad's van. I said I would be going this weekend but I just remembered I'm working next Friday... Edited September 30, 2012 by Fred931 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.