TN94Z

iTrader: (14)

I will be building my car over the winter for the NMCA street race class. In reading the rules, it looks like I will be limited to a D1SC. Like the title says, what is the biggest ci. I can use with the D1SC? It looks like the class runs low 9s as the fastest maybe a very high 8. I know these times are possible with this unit, but what would be its max?

98transguy

iTrader: (7)

well KP has run bottom nines with a d1 with his 346.not sure if u ran a 383 if the d1 would run out of steam up top or not. u could probably get away with an ls2 block with stock crank. in the rules is there a limit on ci?

TN94Z

iTrader: (14)

The max ci is 415 for the class.

TN94Z

iTrader: (14)

I have read alot of threads about his setup and asked him a few questions. Actually, I think I could do very well with an idnetical setup as him, because my car is quite a bit lighter than his. Of course the piping and head unit would add some. I was just curious what my limits would be with the D1

CHRISPY

You may as well build the motor to 402-415ci and max out the D1SC and see how quick you can get it to run

Are you allowed to run any pulley combo? What about intercooling and octane?

If you are octane or intercooling limited I'd definitely do the larger motor...

SC'ers aren't as finicky as turbochargers with displacement, they are pulley/rpm dependent on power.

Cmarsh

Build up a high compression 402/408 and throw some boost at it.

TN94Z

iTrader: (14)

1.12a) PULLEYS/BELTS: Standard-width 6-rib, 8-rib, and 10-rib serpentine belt systems are permitted. Cog belt systems are permitted.

1.24 AFTERCOOLER/INTERCOOLER
AFTERCOOLER/INTERCOOLER: Entries may run intercooler or aftercooler with 100-lb weight adder. Intercooler may be air-to-air, or air-to-water, but must be fully located in engine compartment, or in front of engine firewall. Intercooler water tank and pump may be located in rear trunk area.


1.6 GASOLINE
GASOLINE: Gasoline as outlined here is the only acceptable fuel for use in this eliminator for the specified combinations (See Section 13). The NMCA-Edelbrock Racing Association reserves the right to check gasoline at any time during competition. Gasoline, as defined by the NHRA rulebook, is a mixture of hydrocarbons only. The average dielectric constant (D.C.) for the hydrocarbons that compromises gasoline is 2.025. This is defined as a reading of “0” on the fuel-check meter.

1.6a) SPEC FUEL: This class requires the use of one of the allowable spec fuels in this class. Mixing of fuels prohibited. Failure to pass fuel check is grounds for disallowance of the run during competition and disqualification from the event during eliminations.

TN94Z

iTrader: (14)

I copied the rules so you would know exaclty what they said instead of trying to interpret what I say. I figured it would be easier.

TN94Z

iTrader: (14)

I was thinking that I could build a 370 with the D1 and make very good power considering what has been done with the 347. but if I can go more cubes then that is what I want to do.

98transguy

iTrader: (7)

i know Bob over at EPP did a 402 with a d1 and by mid track the car was pulling timing and the blower was out of steam. Here is the link to the car.
http://www.exoticperformanceplus.com/hotCars.php?car=69

TN94Z

iTrader: (14)

That is what I am worried about with the bigger ci.

Websy21

iTrader: (34)

Ita all depends on how much power you want to make. I looked into this and had a thread a lil while back about this. Basically the D1 will max out on a big cube motor but will it max out for you? Obviously you have plans for some big power but a 408 and D1 would make 700rwhp easy. There are a few on here that have 750rwhp with that combo. I shouldn't say easy but it can be done if done right. I say go for it, bigger is always better wehn talking cubes IMO. If you decide you want 800rwhp+ you could always upgrade the head unit to a F1 and make some serious power. Not sure how far you are willing to go with the suspension/fuel/drivetrain/etc supporting mods that will really become an issue at those power levels. Not too mention weight. I say you should list your goals, I picked a 408 for the touque and room to grow in the future If I decide to ever do it. Also, you don't have to work the power adder as hard to make the same power with smaller cubes but it will max out on a lower boost pressure though. To many variables all pending your individual needs and wants and most imprtantly you budget. Just my .002

TN94Z

iTrader: (14)

Well, the rules in the class that I stated I was going to run limits me to the D1, so upgrading to the Fseries is not an option. It's not that I am just trying to build the biggest baddest motor that I can. I trying to build the best motor I can "for this class." So most of my goals are dictated by these rules. I listed earlier that the car needs to be in the 9 teens-high 8s. If it wasn't for the rules then I would go 408 with a Fseries, which was my original plans until I read the rules. The car has full suspension already. The car only weighs 2900lbs. The rear and fuel will be done this winter.

Websy21

iTrader: (34)

My bad, thats why you should always read the full thread The 370 seems to be a great FI motor and would also save on the extra weight from a bigger motor. Plus the D1 should be enough for it

98transguy

iTrader: (7)

so the car with u in it weighs what about 3100lbs? u are going to need over 800 hp to hit high eights. and i would think twice about putting an iron 370 in there,i would use either a stroked ls1 or an ls2 alum block.the extra weight of the iron block wouldnt help.i know EPP has done 750rwhp with a d1 on a 346 in a vette. all u really need to do is make over 400rwhp on motor and get more than 15 psi out of the d1 and u should be over 800rwhp.good luck.

Pro Stock John

iTrader: (34)

I'd go .030 over LS2 to save the weight, getting 8.9's out of a D1 will take a big of work and you might as well use the weight savings.

ty_ty13

iTrader: (42)

talk to slowhawk or mike at dez racing.... they do alot of procharger cars on 8 rib belts... i would use the biggest bore i could along with a 4'' stroke.... get a bare casting all pro head send it to a proffesional head porter... get a huge exhaust valve with 2'' headers buzz the rpms up and go for broke just like everyone else... i would use a intercooler thats A2W and put the water tank in the trunk... that will take car of the 100lbs by it self...

TN94Z

iTrader: (14)

The aluminum LS2 is what I originally had in mind. But I have had alot of things in mind since deciding on a class to actually build the car for!!! I would really like to build a car for the Mean Street class but it is undecided if they are going to allow the LSx engines in there or not. Anyway, how much does KP weigh? His car is running 9 teens with a 347 and D1, right? Or was that just with the F1??

TN94Z

iTrader: (14)

I would go with a single turbo setup but I figured that would be a more expensive alternative and harder to get the tune right...especially by '08!!

Websy21

iTrader: (34)

Kp has been in the 9's lots with the D1, I am pretty sure he actually runs it alot more than the F1 too.