I am looking to put a new exhaust system on my grand national. The car is stock as of now but I was planning on doing bolt-ons for now like a chip and some kind of cold-air intake. I am looking at the ATR dual 3" exhaust with a 3" downpipe(DP303) by ATR. Will I have to replace anything esides the cat to make this fit. Alos is the Terry Houston downpipe a better choice. I am using a stock wastegate.
Question:
How much will adding a set of 37IB injectors,
Terry Houston Downpipe, dynomax exhaust system,
low temp. thermostat increase overall performance in terms of 1/4 mile, 0-60 speeds & power.
Thanks
Its almost impossible to answer your question without knowing a lot more about your current state of tune. And even with that information, specific metrics are guesses at best. A lot has to do with the skill of the person tuning the car and the combination of parts.
Larger injectors will do nothing unless the additional fuel deliver is needed.
The TH downpipe is a good piece. Though you can't assign a specific ET value to what it will do for your car.
The exhaust question has been addressed in one of the other areas you posted in.
A 160 thermostat is a good addition that helps curb detonation and keeps engine compartment temps down. (i.e. Doesn't heat the intercooler ambiently) I would not venture to assign an ET value to it.
Not to be discouraging, but you really have to look at the whole system how various parts work together. There are venodors that have assigned specific performance values to the addition of various parts to a TR, but its very hard to substantiate such absolute assertions.
Take a look at the 'recipes' on our site for some step-by-step information on how a combination of mods might work for you.
A good exhaust system is always a good upgrade.
The ATR pieces are very nice. A Terry Houston pipe (or one of the 'clones') is probably better suited to a 'stock' car than the external wastegate types. However, I think there are other upgrades that should be considered before a downpipe. Its easy to go into the very low 12s (or better) with the stock downpipe. See the 'recipes' on this web site for some proven combinations.
Please disregard my ignorance, but what exactly
will a scantool add in the performance world
to my GN as this was part of one of the recipes for one gentleman?
A scan tool is a device or software used to read the values your ECM is seeing from engine sensors and the values it hbas calculated for running the engine. Without one, it is basically impossible to tell much about your state of tune. To properly tune a TR, a scan tool in combination with some key gauges (boost gauge, fuel pressure gauge) is necessary.
Without such tools, you're operating in the dark and will likely not extract the full performance potential from any modifications you make.
For more information and a comparison of some such tools, see http://www.turbo-link.com/tlink/scanchart.html
Ok, now how much will this device run and of course how much will a shop charge me to install it? By the way, you answered my questions earlier regarding upgrading the exhaust on the GN, as you can probably tell, this is my 1st muscle car, in any event, the dynomax system i have heard good things about but would you rocommend them over flowmaster system lets say. Is not the cat back design on the dynomax system? Getting kinda confused??
The page I referenced tells exactly how much each of these tools cost. None of them will require a shop to install them. Most are software based and run on a laptop or are standalone removable units.
I would recommend neither exhuast system unless you are on a very tight budget. There are much better systems in aircraft quality stainless steel available from various TR specific vendors. See our 'vendors' page for sources.
Thanks!!
White racing has a good reputation but the going rate for exhaust systems aside from those I've mentioned can run well over $600 whereas the dynomax is around $350...I'm trying to upgrade the
vehicle for street racing only and make the car faster in this respect but not looking to spend any more than $1500 in parts..
My car is bone stock right now and my first upgrade would NOT be the dynomax thanks to scott K. but an ATR 3" cat back stainless steel unit,
with just this addition, how much more torque and HP will the GN generate do you think??
Again, it all depends on combination and tuning. Over a 100% original stock system, perhaps 20 HP. Just a guess, really.
Unless you were to start turning up the boost and fuel, Scott's guess is probably bang on. When you start getting into more serious modifications, you will notice that the exhaust will easilly support them. For example, in a car with bigger injectors, a chip, and bigger turbo you may see a 30 HP increase with an exhaust upgrade as compared to just a 20 HP bump over a stock car. Some say stock exhaust will see low 12's but I would play it safe and upgrade once a few basic modifications are done. Generally with either the Hooker or ATR exhaust, you only need to buy once. They can flow a lot of air, the 3" ATR has seen 10's. I used Dynomax, and felt an increase by switching to Flowmaster (don't believe the myths!). However, other systems will flow much better than either of these.