L67 mild mods

[jsnyder49090]

Ok guys i picked up the engine yesterday and i am going to be ordering some parts to replace before i put it in and wanted some input.I am replacing the plugs and wires Wbody store has a high flow fuel filter suppossedly has anyone tried this? i will be replacing the filter as well so if this is actually better? I want to use a 3.4 pulley i am making my own CAI nothing special.I am going to take the flange on the exhaust and make a straight as i can 2.5 exhaust all the way out i will not be using any cat or 02 i do not want it loud at all just to flow, anyone have any advice on a muffler?i would like to use a 160 degree stat, my car is a 98 from what i have read i am able to do this right? I will probably have my PCM flashed but who is the best? i saw some crappy write ups on ZZP and Overkill but idk thats why i am asking.I am like an hour from ZZP but all the stuff on there site looks overpriced to me.What about the intense oil spring kit? Is it needed? Did i leave anything out that anybody else would do?I will hand port the TB myself and remove the screen,egr delete, rear 02 etc.I am going to use stock manifolds cause of money right now but i feel my exhaust will do what i need it to at this level do you think if i used header wrap on the crossover etc it would help at all or be worth my time?The most i would maybe later do is cam, rockers or Meth Inj, one or the other the advertisments on the Meth Inj seem great but i havent seen much said about them here? Any input or ideas at this point would be greatly appreciated. What about running E-85 or a mix?

[matt5112]

You can do what you want, or you can do what others tell you to do.

Just know you'll need to adjust your MAF table with a ported TB and leave the screen in.

[FordMan77]

I think you need to take a good solid read through this thread before you have to buy another new motor.

http://www.grandprixforums.net/safel...car-17482.html

[jsnyder49090]

Can adjusting the MAF table be done with the PCM tuning and why would i leave the screen in? I was reading a Ford article with a procharger that has a screen when they removed it it picked up 50 hp i realize it was a much more complicated build but i have been taught more air more power why not remove any restrictions in air intake or after?

[jsnyder49090]

Thats why i am here for input from what i have read the mods i am asking about would be safe for this engine

[matt5112]

The MAF is adjusted via PCM tuning.

The screen smooths out the air to ensure you have more consistent readings.

If they picked up power, the screen doesn't flow enough for the power they're trying to make.

More likely than not, you'll never make that power with a 3800.

[jsnyder49090]

I am here to learn and get input from people who have been down this road or similair so dont take it as disrespect .

[jsnyder49090]

I realize that and appreciate your input but what is the screen for debris? They look very restrictive to me and common sense in power making tells me to remove it.i am not worried about ingesting anything in the engine at all. Its the same principle as a air silencer to me it restricts and should be removed.Anything i have read or saw that said anything about smoothing out airflow has been on a infomercial like that tornado thing lol.The screen is after the TB correct feeding into the blower right?

[blueguy]

No, the screen is at the front of the throttle body, to smoothout airflow to improve MAF readings since the MAF is in the throttle body itself...not pre-TB.

[jsnyder49090]

ok my bad but at the same time some of the aftermarket or upgraded Mafs some had no screens and if bigger is better the screen seems like an easy way to gain more flow

[blueguy]

Sure.

When you need it.

And you won't until you're running a dumb small pulley and have a modded valvetrain.

[dsmuts]

Put headers on your car first thing. The stock manifolds are super restrictive.

[Z34Phoenix]

gain or no gain aside, removing the screen will directly effect the readings the maf will return. this will force you to have tuning performed to get these values back in line. like said the screen is there to smooth and even out the flow of air. by having an even flow of air the value the MAF sees is more accurate.

My personal opinion and experience on it is the following:

one of my first mods after and air filter was to remove the screen on my DOHC's MAF. everything seemed fine with the car. but when you would floor it every now and then you would get an SES light indicating the maf values were off. and IIRC bank 1 lean! This is BAD.

It wasnt long until i got my DHP powertuner and began learning to tune. once i did a maf tune things worked great. Now is it worth it. not really

like said the screen is not a restriction. lets say the screen can flow 700 cfm. the TB might only flow 650 cfm and the engine might only be able to use 670 cfm... so.... making the MAF able to flow 750 cfm wont help cause the TB would still restrict it.

[jsnyder49090]

I would think on a blown engine the screen would be much greater but i am new here and this will be my first build on a L67. As far as the headers according to the places that sell the parts they are not necessary for the mods i am doing i wont have a cat and a free flowing muffler. I realize headers would be a huge benefit but i think removing the cat will make a big difference i do not agree that a cat doesnt restrict maybe if you buy a high dollar one i remove the cat on all my older vehicles i work at a muffler shop it doesnt cost me anything.I have noticed a huge difference in power and mileage removing the cats and all of them have been NA so i know it will be more on blown car.To be honest i got a deal on the car they wanted 2500.00 for it until he let someone test drive it and brought it back knocking i paid 500 and a set of wrenches for the car.The engine i paid 200.00 and traded a car dvd and a couple sets of s-k sockets. I got the complete engine with cradle and trans that needs rebuilt and another blower , PCM with harness. Its going to be low buck all the way I want to sell what i have and find a monte or impala ss with the 5.3 i think that is a much better starting point.Anyone have any used headers?

[Slick2500]

Ok, first off the spacebar is your friend and so are paragraphs.
Second you can not safely run a 3.5 pulley on stock exhaust manifolds you don't have enough flow, let alone a 3.4. And the cats on these cars do not restrict the exhaust flow unless they are clogged.

[dsmuts]

To safely run my 3.4 I had to run headers and modded 1.9 high ratio rockers.

[matt5112]

Well until you can safely run something smaller than a 3.4 pulley, the stock TB/MAF is fine.

Then you'll want a larger TB and MAF. Removing the screen wont help you enough for it to be worth the inaccurate readings.

http://www.zzperformance.com/blog/in...-and-theories/

And to bring up other platforms is amusing. When building a serious engine, they typically opt for speed density and remove the MAF as a restriction as well as removing a failure point.

[thomas mcnulty]

200 headers or 140plog,, first upgrade fosho

[99PontiacGTP]

If you are just going to sell the car then don't bother modding it. All that does is restrict the number of buyers. If you still want to:

Only start modding if you have a way to check for KR. Scanguage II is cheapest.

Don't bother with a 160 t stat... go with a 180 if you feel the itch. Make sure your PCM is tuned to turn on your fans sooner(yeah, that means getting a tune).

Headers off e-bay are 200$ and work just as well as the 500$ ones.

That brings the tally up to 600 and that is without the pully drop yet(another 90ish + a pully remover rental)... Cheap enough? If not you really should consider keeping it stock. The more mods a car has the more stuff can go wrong. But I think thats because the owner tends to be harder on a modded car... to get their monies worth...

If only there was a place all this could have been read. http://www.grandprixforums.net/safel...car-17482.html (Safely Modding Your 3800 Powered Car!!)

I apoligize for any offense, and the slight sarcasm. I'm an evil cynical troll aparently tonight.

[jsnyder49090]

No your good i am here for input there is too much conflicting info and i aplogize i am on my phone and i have AT&T lol so Here is why i said what i did and i dont have a mouse to cut and paste.W body store "to run a 3.5-3.4 pulley with no knock 1.intake 2. Perf PCM or tuner 3.Downpipe or headers 4.colder therm 180 5.two heat ranges colder plugs AL104s I read this and you guys are telling me something else. IDK whom to believe but Wbody sells the items so.