u bend

[smoovrider]

hey i went to a muffler shop and the guy to me it was a mast of money to take the u bend off. now be honest wit me has anyone actually felt the difference when they took there off? did it give u like more horsepower or it just let the air out ur exhaust more smoother?

[The Burning Rom]

Nobody has ever dynoed to see the differences, but it is estimated that it is a 3hp or so gain. It just helps the exhaust flow a lot better.

[carnutcass]

It's probably fair to say that if you don't plan to do other performance mods then yes, deleting the u-bend IS a waste of time and money. However, if you plan to add a smaller pulley, CAI, thermostat, and other go-fast mods then every little bit helps. If you've never looked at a U-bend when it's off the car I can tell you, it is clearly a restrictice part of the system.

[The Burning Rom]

I would agree that it's very restrictive....look at my comparsion pic from my pipe install

[kilroypr]

Originally Posted by The Burning Rom

I would agree that it's very restrictive....look at my comparsion pic from my pipe install

THis means that my 320bhp GTP could get any gains from straigthing up the bend? Where you got your straight one. Have not seen it before

[carnutcass]

What mods have you made to your car kilroypr? I really don't mean to sound like a dick, but how in the world are you producing 320 hp? Are you talking about flywheel hp?

Take that u-bend off and throw it as far as you can.

[The Burning Rom]

The straight pipe is an RT downpipe from www.3800performance.com

[smoovrider]

iight ill have it removed. i did order a stat 160 but i was the wrong one i neededa 180 and i dont think i can send it back i had almost three months i dont see what the problem is why wont it work? i got a fwi system. im ordering the westwing spoiler next month.

got another questiong any one know what u can buy two different set of rims. cuz i want to pust 18.5 in the back and 18 in the front, can some one give me a site to look at thanks

[The Burning Rom]

Originally Posted by smoovrider

iight ill have it removed. i did order a stat 160 but i was the wrong one i neededa 180 and i dont think i can send it back i had almost three months i dont see what the problem is why wont it work? i got a fwi system. im ordering the westwing spoiler next month.

got another questiong any one know what u can buy two different set of rims. cuz i want to pust 18.5 in the back and 18 in the front, can some one give me a site to look at thanks

The 160 will hurt your performance unless you have your PCM modified with lower fan turn on points. I'm running a 160 right now with a stock PCM....not good My mileage sure suffered.

As for the wheels...I'm not sure they make 18.5" rims for the GPs. I know for sure that they make them for trailers. Either way, there is a good chance it will screw with your ABS if you mix rim/tire sizes. That's a chance I wouldn't take. If you wanna take that chance, the best place to look at is www.tirerack.com

[smoovrider]

oh thats what i thought. well i got a unusable stat guess i could sell it on ebay. yea they do sell 18.5 but i dont see how that could mess up my abs. but thanks anyways man

[kilroypr]

Originally Posted by carnutcass

What mods have you made to your car kilroypr? I really don't mean to sound like a dick, but how in the world are you producing 320 hp? Are you talking about flywheel hp?

Take that u-bend off and throw it as far as you can.

Well, I have not made that many modifications but the dyno test shows 295hp. Here is what I have done so far. I installed new 3800 crate engine with reinforced piston arms. I installed a machined eaton supercharger with a 3.2" pulley. This pulley pump on the car 14psi, this is the first time I hear a SC unload pressure when reving the engine.
I assume the 2.4" pulley pumps around 20psi(I have only used it once and was not checking the boost gage I installed). I lowered the std transaxle gear ratio from 3.29 to 2.93 and in theory I am supposed to reach around 160mph at 5500 rpms
I reprogrammed the ECU(PCM, for understanding of other comrades), to do the trick. IT is not the engine alone. I can say I have 320hp at the flywheel because 295hp dyno test.
The ECU has Honda's V-Tec technology and controls how and when the automatic transaxle will shift gears and what clutches engage at any given time.
The added engine bhp with the ECU are to compensate for a slugish start a heavier gear ratio will put on the car. I can not tell you exactly the ECU magic but I asked the guy that reprogrammed it to add V-Tech like behaviour, take out the speed limit, pump the torque to 300 and have around 300bhp.
He modified the length of injector intake and the crank position sensor signalling for the V-tech thing among other things. The only mechanical modifications made to the engine were the reinforced piston arms and the modified eaton supercharger, besides that everything else is on the ECU and transaxel combination. Even the transaxel acts like a 6 speed on high gear because of multiple clutches engaging.
That is why the dyno test shows 295bhp and I can assume the engine is around 320bhp.
I have raced a Porsche Cayenne S and nailed the sucker at 138mph, 12psi and engine reving at 4750rpms.
That is honest to the truth what I have on my 98 GTP.

[kilroypr]

Originally Posted by smoovrider

oh thats what i thought. well i got a unusable stat guess i could sell it on ebay. yea they do sell 18.5 but i dont see how that could mess up my abs. but thanks anyways man

The reason it can mess your abs is that the ABS Module has a sensor on each tire. It knows when to engage bacause all tires are not turning at the same speed when on normal conditions they should be almost all turning at the same speed. When this happes it will try to make the faster spinnig tires go slower and reach the slower spinning tires speed when you press the break pedal. That is why the low traction light turns on when you burn rubber, there are tires running faster than others on your car is the same principle applied to starting not stopping.

if by any chance you alter how the abs determines when your car is slipping then you wont get the ABS bennefits at all because it might not engage when you need it.
IS not that is going to break it but will blind it a little.

[smoovrider]

okay i got. i should have bought me a gtp in stead of a gt.

[ydtrack]

Removing the U-bend AND resonator will produce some noticable differences on the freeway.

You can have a U-bend delete fabricated or buy one from PFYC.


The resonator is also a big restriction as it is open in the front but chambered in the back producing yet another bottleneck for the exhaust.

[brianteel]

Originally Posted by kilroypr

Well, I have not made that many modifications but the dyno test shows 295hp. Here is what I have done so far. I installed new 3800 crate engine with reinforced piston arms. I installed a machined eaton supercharger with a 3.2" pulley. This pulley pump on the car 14psi, this is the first time I hear a SC unload pressure when reving the engine.
I assume the 2.4" pulley pumps around 20psi(I have only used it once and was not checking the boost gage I installed). I lowered the std transaxle gear ratio from 3.29 to 2.93 and in theory I am supposed to reach around 160mph at 5500 rpms
I reprogrammed the ECU(PCM, for understanding of other comrades), to do the trick. IT is not the engine alone. I can say I have 320hp at the flywheel because 295hp dyno test.
The ECU has Honda's V-Tec technology and controls how and when the automatic transaxle will shift gears and what clutches engage at any given time.
The added engine bhp with the ECU are to compensate for a slugish start a heavier gear ratio will put on the car. I can not tell you exactly the ECU magic but I asked the guy that reprogrammed it to add V-Tech like behaviour, take out the speed limit, pump the torque to 300 and have around 300bhp.
He modified the length of injector intake and the crank position sensor signalling for the V-tech thing among other things. The only mechanical modifications made to the engine were the reinforced piston arms and the modified eaton supercharger, besides that everything else is on the ECU and transaxel combination. Even the transaxel acts like a 6 speed on high gear because of multiple clutches engaging.
That is why the dyno test shows 295bhp and I can assume the engine is around 320bhp.
I have raced a Porsche Cayenne S and nailed the sucker at 138mph, 12psi and engine reving at 4750rpms.
That is honest to the truth what I have on my 98 GTP.

are you stupid or something...how long have you had your car that you think all this stuff. you think with a crate motor and a ported super you will have 320hp. I dont think so. where is this dyno read out. and the stock gearing in the GTP is 2.93 not 3.29. Next time you get something done on your GTP go to www.clubgp.com and ask some questions. What reinforced rods are you talking about?????? V-tec in hondas has to do with changing valve height.