400RWHP + 20MPG... How to do it??
- Thread starter MeanMussy
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NUTCASE said:
Yeah guys, I realize this.. but I was just setting goal. It was easier to quote a peak HP number than it was to draw a TQ curve and ask for a motor that can match it (I used to do that for a living, only w/ AC and DC motors.. its no fun.
) I just wanted to use the 400RWHP as a gauge. I could easily build a 20mpg motor at 150HP, but what fun would that be?
like previously said, build a good strong n/a motor that can put down 300rwhp by itself. throw a s/c on top of this and stay out of boost (usually 3000rpm+). When you want the power, its there. Even vortech's bottom of the line v1 s-trim should put you at your goal. Good-luck. (by the way, i have similar goals w/ the combo in my sig, 20mpg but only 300rwhp)
also, don't be afraid of a 331 or 347. tha extra low end torq will actually result in your motor requiring less effort to scoot you around at the lower rpm's
whats the use of overdriving the hell out of your setup if your motor does't have the part throttle low end to lug it down there. take away the torq, and you will actually bur more feul forcing the motor to work at an rpm that it is very innefficiant holding
whats the use of overdriving the hell out of your setup if your motor does't have the part throttle low end to lug it down there. take away the torq, and you will actually bur more feul forcing the motor to work at an rpm that it is very innefficiant holding
Am I the only person that believes that 400whp can be made N/A?
Why not run an all motor setup with a stock crank, I beam rods, and hyper pistons to yield a nice, light rotating assembly, and run some AFR205s or Victor Jrs with an RPM II or Systemax intake and a nice FTI cam?
Top it off with some 36/42lb injectors, and a 255lph pump, along with an MSD setup, and you should be there...
Hell, Ed Curtis makes 325-345whp on a STOCK BOTTOM END with 165s, a cam, and a ported manifold of his choice on street cars all the time?
I would call Ed, at Flowtech Induction, and talk with him about a N/A Motor...
Throwing a supercharger/turbocharger in the mix will decrease the gas mileage... a N/A combo will ALWAYS get better mileage than a comparable boosted motor....
Why not run an all motor setup with a stock crank, I beam rods, and hyper pistons to yield a nice, light rotating assembly, and run some AFR205s or Victor Jrs with an RPM II or Systemax intake and a nice FTI cam?
Top it off with some 36/42lb injectors, and a 255lph pump, along with an MSD setup, and you should be there...
Hell, Ed Curtis makes 325-345whp on a STOCK BOTTOM END with 165s, a cam, and a ported manifold of his choice on street cars all the time?
I would call Ed, at Flowtech Induction, and talk with him about a N/A Motor...
Throwing a supercharger/turbocharger in the mix will decrease the gas mileage... a N/A combo will ALWAYS get better mileage than a comparable boosted motor....
LukeDaddy said:
are you talking on a 302.......I dobt it. you can get to 400hp no problem. but you won't have the tq at like 2000rpm that you need to see great milage. one of the reasons like engines like the LS7 can get like 30mpg out of 7.0 liters is the fact that it is very torqy, becouse of its cubes it can maintain better air velocity in the heads and intake. so when you are crusing at 2000rpm that motor is barely trying. and YES, I am implying that higher cube motors can posses the ability to yeild better gas milage.
as far as N/A vs boost for gas milage, it is possible for the n/a motor to get better milage becouse s/c's and turbos create a drag on the motor. however, I don't posses the technology and the resourses in my garage to make this happen. and it would also be very costly. it would be 1000000x easier to just take a 5oho motor in good condition and put a turbo on it. let the stock motors low end take care of the low end efficiency and let the turbo put up you top end dyno queen numbers for you
QDRHRSE
New Member
It's not hard to do. I can get just a little over 20mpg on the highway and I'm a little over 400rwhp. I have a simple combo and still have all of my emissions stuff working. As long as you don't get crazy with porting and use a sensible cam and gears almost any supercharged car can do it. If you stay light on the throttle its totally reasonable. My combo consists of a 306, gasket matched twisted wedge heads, gasket matched cobra intake, a crower cam similar to an e cam, 75mm throttle body, 80mm pro-m, novi 1000, shorty headers, high flow cats, 3.55's in the rear. On the highway during really long trips between LA and the bay area I have done substantially better than 20mpg traveling at 80- no more, no less- 80. Anybody who says this can't be done hasn't tried. Its a piece of cake. I haven't read all the other posts so I hope I'm not being redundant. A blower will be the easiest way to get good mileage.
Dean85GT
New Member
NakedRaygun
New Member
bluevenom867
I will have images of molesting stuffed animals in
Simple,a high VE at low rpm.Build a motor for lots of torque,low-mid rpm power,and use the EFI to keep the a/f ratio as lean as possable.Coated bearings and thermal coatings would be nice.Also,optimising the cam to get the most compression pressure while keeping the actual compression ratio low.And I would get a timing adjuster so you can change your ignition timing inside the car.
I know that can be done n/a,it just takes alot of though going into it.Of course,nitrous with a motor like this would be a sintch no make 500hp.
I know that can be done n/a,it just takes alot of though going into it.Of course,nitrous with a motor like this would be a sintch no make 500hp.
bluevenom867
I will have images of molesting stuffed animals in
Remember that fuel is power,if you can make a turbo motor use less fuel than a n/a motor.
You just cant build a n/a motor...
You just cant build a n/a motor...
Daggar said:
Yep, I don't want an in town average of 20mpg, I'm just shooting for that on the highway. I KNOW, in town, I'm going to be on the skinny pedal and I'm fine w/ crap gas milage at that point.
Foxfan88 said:
OK.. All I was saying is, this thread isn't about IF it can happen, it's about HOW it can happen w/ a 302/351W based motor, in a Fox body.
You guys are funny that say a high revving, naturally aspirated 306 wont make any torque...
Are you serious? Stock 5.0s are rated at 300fwtq... which is a pretty stout number from the factory... installing aluminum heads, a custom cam, and a properly matched intake manifold will definately not DECREASE the factory rating..
I dont know about you, but I drove a basically stock 5.0 for 4 years, and not much could keep up while I was on the gas... theres no way a built motor would be any less impressive on the street...
This guy isnt asking your opinions on whether or not he should try this... he stated in his first post HE IS going to do this, and wanted suggestions on how... All that he has gotten is why it shouldnt be done without a huge shot of the gas, or a nasty blower/turbo
Are you serious? Stock 5.0s are rated at 300fwtq... which is a pretty stout number from the factory... installing aluminum heads, a custom cam, and a properly matched intake manifold will definately not DECREASE the factory rating..
I dont know about you, but I drove a basically stock 5.0 for 4 years, and not much could keep up while I was on the gas... theres no way a built motor would be any less impressive on the street...
This guy isnt asking your opinions on whether or not he should try this... he stated in his first post HE IS going to do this, and wanted suggestions on how... All that he has gotten is why it shouldnt be done without a huge shot of the gas, or a nasty blower/turbo
