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#1
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Exhaust and cross over pipe question
i have a 73 b body road runner 4 spd i'm gonna get flowmaster 40 series mufflers i was gonna get 3" and dump it at the axle or run it out with tailpipes but a guy said i dont have enough horse power i will lose torque off the line cause low back pressure so i decided to dump 2.5" exhaust at the axle and have a cross over pipe connecting the two pipes thats what a flowmaster tech said to do for most performance my 440 has 400 and some horse
1 how far from the collectors should i put the cross over pipe i have a manual trans to? 2 is X pipe about the same as a cross over for performance? 3 does this 2.5 setup sound the best for my car? 4 the tech told me to have 12 inches fo straight pipe after the muffler then a 45 degree turndown i dont thing i have enough room for 12' after the muffler thanks!!! Flowmaster tech said this some of it dont sound right see what you thing run 2.5 pipes start the cross over closest to the collectors run the mufflers 19 " after the collector then 12" of straight pipe then a 45 degree tundown starting the muffler 19" is to close for my car |
#2
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ideally you can tune the collector for optimum length. You can extend the collector, uncork 'em and run a few WOT drag runs, then check the collector for a color change (sometime a little paint helps) . That is where you can reduce them to 2.5 and run the X pipe. Run the mufflers anywhere after that and run the pipes to the bumper and then turn them down. This'll keep the pulses from reflecting up and causing a reverb when you drive. There is a formula for an optimum collector volume somewhere out there.
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#3
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I ran 3'' to the mufflers and then drop down to 2 1/2 after that. 18'' has been the standard torqe tube requirments for my engines.
For street aplications I would put the muffler about under the rear seat. The x pipe does not need to be 3''. Remember that x pipe is not flow related. It`s job is to equalize pressure from side to side. |
#4
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Quote:
does it matter where i put the crossover pipe? do you think 2.5 dumped at the axle with 40 seris will b nice? |
#5
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You can dump it at the axel.But consider this,1st it only takes a small gas leak to start a big fire,2nd inside the car will be quiter with tail pipes. This is incase you have a radio. the location for the best x pipe. I really couldn`t say, In terms of optimum perf;
Of course some where before the mufflers . Other then that I would find a spot that would be up out of the way,for road clearance and such. Idon`t have an x pipe on my 73 charger or tail pipes. But I do have the3'' from the headers to the flow masters with a 45 degree bend pointing towards the rear tires. Works grate and I really like it. But then my cars never use the radio. Happy trails |
#6
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Re: Exhaust and cross over pipe question
chief..... let me start by saying "yes" run the 3" exhaust with the cross over just behind the trans tail shaft. that way you don't haft to drop the exhaust to change the tranny. and running it to the axle and pointing it down is real cool. i'm running a 400 big block chrysler. i also have 2" primary headers that are fender well exit to a 3 1/2" collector to 3" dual exhaust with a cross over behind the tranny finally ending just before the rear end pointing down. i have no problem running 11.32 in the quarter. i too have 450 hp with just a little snort of nos. i also drive this car to work every day. the drivability is great and the sound is commanding to other cars on the road. and everyone looking is always a plus.
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#7
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my 73 road runner 4spd has a 440 with a dominator accel super coil 750 double pumper holley and its sapose to be built some but i dont know what all is done to it so i'm guessing i have 400 and some horse so what would be the best 3" or 2.5 dumped at the axle with 40 series?
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#8
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2 1/2 would be good.
that peice will be so short that it won`t macke any real differance either way. |
#9
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H pipe and x pipe
so whats better for my 440 pefromance and souns wise? H pipe or X pipe? the x pipe can muffle shops like muffler man make x pipe or h ipe for exhaust or do you have to do it?
which would be best for my 68 440 dominator intake 750 holly dbbl pumper accel coil yellowjacket wires holley ma fuel pump 4 spd 4.10 gear i dont want less torque off the line cause of too big exhaust wich would best match my car for speed performance and nice powerful sound so people will hear me and look 1 3" to muffler then 2.5 tail pipes 2 3" all the way back 3 3" dumped at the axle 4 2.5 dumped at axle 5 2.5 all the way back thanks a lot guys for helpin me out with all these questions i'm glad to get help cause i'm going to race my friends 77 trans am that talks crap all the time how hes gonna smoke my 440 magnium hes starting to piss me off and i wanna show him whos boss |
#10
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Choices
Go with the 1st choice 3" to the muffs 2 1/2 out the back.
H-pipe will do what you want it for. You don`t need 3' out the back. That would only make the muffler man curse more any way. He will have enough trouble snakeing 2 1/2 through there anyways. Go find that fire bug. I mean fire _ird. My spelling seems to be lacking. Could you tell me if it is a t or a b that goes in the blank? |
#11
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I recently changed from 2 1/2" to the bumper with an H-pipe to 3" to the bumper with an X-pipe. It didn't make any noticable difference other than the sound and slight whistle coming form the X-pipe. I used TTI tailpipes and hangers, Dynomax Super Turbos and an Dr. Gas X-pipe. My muffler guy did a fabulous job putting it together, but I think he will run and hide next time someone brings him an X-pipe. The pieces supplied by Dr. Gas would not work for my application and he had to fabricate some of the pieces.
3" is not easy to work with I understand. It has a tendency to crush rather than bend. Also keep in mind bigger is louder. Think about what you are trying to accomplish with the car and what you are willing to tolorate. I love driving my car around town on occasion and really want it to move at mid and upper RPM, but wouldn't want to drive it everyday. Too noisy for my taste. I am about to change the exhaust on another musclecar car I would consider driving daily. It will get manifolds, 2 1/4 to the bumper and mufflers that allow me to hear the tires on the highway. Use your best judgement... |
#12
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Exhaust
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#13
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1 more question
so running 3" to mufflers then 2.5 all the way to the bumpers with 40 seris
is that gonna be better performance then 2.5 dumped at the axle? i want the car to be loud so everyone hears it like that earthquake feel of power but i dont want it too loud like open hearders where i will get pulled over for sure driving on the road what do you guys think? i like that when a car goes buy and and you can tell its got power cause of that cool sound and shakin yer chest a little but not where i will get pulled over no doubt thanks!!! |
#14
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I have not done a lot of reading on H pipes yet, cause I am not quite ready to drop my engine. So, what are the advantages of the crossover. I have heard, increase power, decrease power, increase torque, decrease torque and cut down on nois.
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#15
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#16
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Sixpackcuda
THANKS for the link to exhaust manifolds,,,They didnt wrote what to gain or lose,,,compared to headers,,,but the fact they wrote as a huge improve to grind your original cast irons is enough for me to try that little trick while saving money for the TTI. Wonder whats the diff is between: untouched original grinded original with extra spacers good headers At least it will do this season ,,,I have to take care of my wife and a new Holley,,,,a new RPM ,,,and a grinded original will do fine at least if you trust it,,,and for the money of buing new TTI:s I can have two weeks of vacation with my wife in the Canarieislands!! Thanks again,,,Best regards Olle B |
#17
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Agreed, Thanks for the info/web. I just need to do some research when I get to that point.
Dave Davis |
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