HOLY jumpin' boost gauge, batman

[dpuckett]

I put the 4" exhaust on today- had some leftovers from a neighbor putting a new exhaust from his 318 Detroit. I went with a 4" elbow at the bottom of the downpipe (kind of regret not measuring THAT all the way thru, but it is on there, six welding rods later), then about 3' of flex stuff, then a few feet of straight pipe, then the muffler, such as it is; dumps right in front of the rear axle.



All I can say is I had NO IDEA how restrictive the stock system is. The boost gauge climbed steadily in a nice sweeping arc, to about 30-38 psi, depending on the gear and how far I mashed the pedal; now it JUMPS to 35+ in 3-5 gears. EGTS seem to be flakier- they go up faster and a little higher , but come down a goodly bit faster. Pickup definitely has a different tone- I can hear the turbo at idle just fine. At about 3psi, it souds like we all are going to go into orbit MPGs will drop to about 16 for this tank, for sure. I have mixed emotions about the upgrade overall, but it does help out in the bottom to mid power band, regardless of what some performance gurus wil tell you. One drawback is, EVERYONE wants to run me now that the turbo can be heard a mile away. I have obliged a few (GMC 1/2t auto, glasspacks; some ricer [SMOKED his butt]), and been outrun only by a Mcustang GT (remember, I have a Getrag that you have to wait a week between gears for everything to spin down. ) I can burn the tires on a 2nd gear start. Waiting for the clutch to start complaining.



Now for an intercooler; I have everything to install it. Except for, of course, the cooler itself. Then I wll be like Oo. Oo. Those of you on the fence about whether to go 4" or not, get off the fence and join us on the dark side



Daniel

 

[sparks57]

So when are we gonna race?

 

[sparks57]

BTW: My EDM's and NV4500/Con O go in next month!



All my engine components are going to be sent off next week or so to get ported.



It also appears that I'm going to head up to Spokane after that to dyno, so we'll have to see what the ol' girl really is puting to the ground.



400HP HERE I COME!!! Oo.

 

[sparks57]

I'm still in the stone ages, crappy 3", but at least it's unique! My exhaust splits and dumps in front of BOTH my back tires. I have a deal with Rip Rook and he's going to duplicate this exhaust in 4" with 5" tips when i feel it's necessary (which I hope is soon! )



Here are some pics for those you haven't seen my unique exhaust, I designed it myself:



#ad




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[dpuckett]

Originally posted by CB_Parker

So when are we gonna race?

AS soon as I get an intercooler, MACH2s, ported and polished head (hey, the one I'm running has 7 cracks in it), and maybe an HX40/H2E- ish turbo. We ought to be at about the same output by then. In other words, a long dam time- some of us older people have bills to pay from mistakes when we were your age. You still have a great gearing advantage over me.



How much you going to bump your HG thickness? I'd go for a . 020 over, but that's just me.



Saw your page; pretty neat rig; like the lights, actually.



Daniel

 

[sparks57]

I'll have to see on the HG... not sure yet.



When you feal up to the challenge... just drop me a line!

 

[phillips5]

I could take off in 3rd gear and set the tires on fire with my 89 and90 before any mods. One wheel peel of corse. When i first turned up the 89 it had 50000 miles on it i put on a 4in stack cranked in the fuel screw 3 turns and added home made propaine kit stock injectors. Would run side by side mustang GT and Transam GTA's. Put 4 headgaskets in it before the 91. 5 change. Every time I beet it and pulled 35 psi boost the next day the boost guage was bouncing (blowed between two cylenders awalys diferent cylenders though)until the fall of 91 than it was good after that.

 

[phillips5]

To speed shift the getrag try grabing the shifter down low and always make sure that you shift square. Both my 5 speeds would get stuck in a gear if I didn't. Remember when you let go of fuel and hit the clutch that the engine and trans rocks back to center and you could hit 5th instead of 3rd after second. I broke the shifter off both of the 5 speeds because of that.

 

[JLEONARD]

All I can say is I had NO IDEA how restrictive the stock system is

Yes, despite what the "experts" say , 4 inch is a great performance upgrade even though we're not pushing over 325 hp.

Jay

 

[cguthrie]

dpuckett, there is a first gen intercooler on ebay right now just search for it. Just thought i'd pass that info



Chris

 

[dpuckett]

Thanks, CGuthrie, but I am broke with a capital 0. That, and I am going to ut a 2nd gen cooler in it- have all the tubing, elbows, boots, intake. Supposed to be bigger and cool more. I plan someday to run neck and neck with CB Parker, when and if I get my hands on some money that isnt just passing from the employer to the bill collector.



Question- Why would my EGTs shoot up faster than with the 3"? Could have been the near 70 deg yesterday, but I was thinking the 4" should have cooled things off a bit. I ran 600* @60; now more like 700* 60 cruise. Only other thing I could think of would maybe that the turbo is freer on the hot side, but I still have the factory air box with its little slit for airflow. May trade with Mom.



Daniel

 

[JLEONARD]

Daniel,

I have opened up my airbox by drilling several 2 1/2 inch holes (largwest holesaw I have). I estimate easily 3x more area for air to enter the box. That's an easy no cost mod.

The larger exhaust should have lowered EGT not elevated it.

Was it on the way HOME from the bar that you noticed the increase?

Jay



By the way, I noticed no appreciable change in EGT when I changed to 4 inch.

 

[sparks57]

I agree, the reduced back pressure should have quickened turbo spoolup and should have cooled off your EGT's a little. What kind of intake are you using now?



You should take a look at Sam's ASA intake to compliment your exhaust, you'd be surpized at how much a good intake helps. When I opened up my intake, my turbo spooled twice as fast.

 

[sparks57]

Originally posted by dpuckett

I plan someday to run neck and neck with CB Parker

Ah, grasshopper... have patience, and the BOMBs will come...







I'm really not far ahead at all, I just have a lot of insider deals.

 

[sparks57]

Originally posted by dpuckett

hey, the one I'm running has 7 cracks in it

And how did you manage to CRACK your head???

 

[CGauthier]

Dam, I was a headbanger in tha 80's, luckily for me it never cracked! Hehe



I no what u mean about bein broke Daniel, dam the weather's been suckin @$$ out here lately and my overhead is high so all of a sudden im findin myself a little behind tha 8 ball So im workin like a dog, usin bombing for inspiration!! That's the good thing about piece work, when you need money you give 'er. Now for your mistakes in tha past... could you be my father? My mom said she's made mistakes too... . my real first name is Luke, is yours Darth Vader? Lol, naw seriously tho hopefully we can all get our hands on some $$$ and be proud of our trucks. EXCEPT CB_Parker tho of course, he's gotta let us catch up a little J/k, Chris is a dam guy Maybe after i get to mod my baby a little we can set up a weekend get together somewhere's half ass central to everyone and have a whale of a weekend; and i'd suggest we play "DODGE Ball" lol

 

[Excessive Force]

I did a few third gear starts at WOT. You know how it is when the guy next to you starts to rev his engine. All i can say is all they saw was SMOKE. Of course that was in the final days of the old GUTBAG,and the stock clutch. The new LUK i've got won't take the abuse,so it's gonna have to go. I went to 4" at the downpipe,and ended just past the cab with a turn down. Sounds great,especially when shifting. "WE DON'T NEED NO STINKING MUFFLER". I'll race ya CB. Just remember Days Of Thunder :"RUBBIN'S RACIN' ":-laf

 

[dpuckett]

After driving it a day; I'd say the muffler has seen better days. Looks good, but doesnt do any muffling. I may pick up a 2nd one when I get the cash. FOr now, I'll just haev to keep my foot out of it.

I'm pegging the boost gauge in 4th and 5th again



Daniel

 

[dpuckett]

Originally posted by CB_Parker

And how did you manage to CRACK your head???

The same way your head seems to be the limiting factor on your rig.



Seriously, the HG was all but closed up when I took it of- had about a 1/16" hole for water to flow through in each passage. I figure it got hot, and cracked under the heat. RIght between the intake vavle and injector hole in all6, plus another crack in an intake valve seat in one of them.



Daniel

 

[quikshft]

My boost guage never sees north of 15 or 16 pounds, will a 4" system change that? I intend to ditch the stock system soon as well as the muffler and go 4" straight thru.

Currently my EGT is 690 at 60mph on the straight and level. I recently drove out of Stove Pipe Wells up the grade (about 5 percent but it's straight hiway) and I had no trouble getting up to 1200 degrees on the pyro at legal speed with a basically empty truck, and had to slow down to avoid heating things up more.