Lots of questions
09-28-2009, 07:11 PM
#1
1st Gear Member
Thread Starter
Join Date: Oct 2008
Location: PA
Posts: 56
Lots of questions
Ok all currently I have a 98 v6 mustang and recently have gotten a 98 Romeo GT Block. Im changing the heads to cobra heads though. The only difference in the blocks is the side bolt lengths for the crank and one other thing i forget at the moment. If anyone has anything they are looking to get rid of like a wiring harness for a 96-98 Cobra please let me know. Or if you have any of these parts that I can use. I have only made a list so far of what I am getting. Only parts I have so far are Romeo Block. All bolts (ARP) for motor and Cobra B heads with stock internals.
Upgrades on the motor that will be done:
Bored +.020 over - already done
All Manley Forged Internals
Cobra B heads - already have
Comp Cams Stage II
Comp Cams valve springs
Hardened steel retainers
Kenny Bell 2.2 Blower - non intercooled
Transmission:
Going with a TKO600 transmission
Aluminum drive shaft
Going with forged 3.73 gears
Aburn pro series posi
31 spline axels with c-clip elims
Things debating on doing:
Methane injection - will cool supercharger and boost octane - only reason debating is because I dont want to have to fill the tank and watch it. I would like to do it but it will become a hassle im sure - anyone currently have it on their car? Cant seem to find anyone that has already done it...
Im trying to run around 14 psi of boost on the KB. Im going to get a smaller pulley but not so small that it slips. Going to have a guy tune the car when finished.
The things that im not sure of are:
-What size injectors to go with?
-What size fuel pump? 255 / 155 ltr/hr
-Suspension - of course im going to replace almost everything - kmember, aarms, shocks, springs, braces, subframe connectors - thing im debating is a 4 point roll cage in the back so I can keep the rear seats. I want to take this to the track so im trying to make sure that a 4 point roll cage will qualify and be worth it etc...?
If anyone can give any advice or pointers I would be thankful and the reason I dont just get a cobra and do this is because I am already replacing almost everything. So it doesnt really matter if I start out with a cobra. Only difference is I have to replace wiring harness and few other minor things...
Upgrades on the motor that will be done:
Bored +.020 over - already done
All Manley Forged Internals
Cobra B heads - already have
Comp Cams Stage II
Comp Cams valve springs
Hardened steel retainers
Kenny Bell 2.2 Blower - non intercooled
Transmission:
Going with a TKO600 transmission
Aluminum drive shaft
Going with forged 3.73 gears
Aburn pro series posi
31 spline axels with c-clip elims
Things debating on doing:
Methane injection - will cool supercharger and boost octane - only reason debating is because I dont want to have to fill the tank and watch it. I would like to do it but it will become a hassle im sure - anyone currently have it on their car? Cant seem to find anyone that has already done it...
Im trying to run around 14 psi of boost on the KB. Im going to get a smaller pulley but not so small that it slips. Going to have a guy tune the car when finished.
The things that im not sure of are:
-What size injectors to go with?
-What size fuel pump? 255 / 155 ltr/hr
-Suspension - of course im going to replace almost everything - kmember, aarms, shocks, springs, braces, subframe connectors - thing im debating is a 4 point roll cage in the back so I can keep the rear seats. I want to take this to the track so im trying to make sure that a 4 point roll cage will qualify and be worth it etc...?
If anyone can give any advice or pointers I would be thankful and the reason I dont just get a cobra and do this is because I am already replacing almost everything. So it doesnt really matter if I start out with a cobra. Only difference is I have to replace wiring harness and few other minor things...
Last edited by lizzyfan; 09-28-2009 at 08:36 PM.
09-29-2009, 01:39 AM
#3
6th Gear Member
Join Date: Feb 2006
Location: Virginia
Posts: 11,786
That's a pretty big list. I hpe it's a real list and not just another "I wish" list, lol. Good luck, here's my thoughts.
I may not have to say this BUT Check the piston dish and CC of the heads because your compression ration is going to drop if you use stock dish pistons in it's forged counterpart. 7.8:1 or 8.6:1 IDR which, is what you'd end up with with stock pistons and a conversion.
With 14lbs you're going to need at least an in tank 255 and a supporting 255 or KB BAP. (My dual 255's have gotten me to 600ish)
If you're getting non I/C and you're running 14lbs you better have meth. (Or water or anything for that matter)
You'll need a 6pt cage to be track legal IF you reach the track times that require it.
I always say start with 60# injectors. If you're buying them why not buy the max injector you'll predict to ever need when they are almost the same price. I paid $333 for mine through Kurgan Motorsports. If for some odd reason you buy 42's and your pumps start reaching their max a bigger injector can help tune through he problem allowing you to safely reach that number you want.
I may not have to say this BUT Check the piston dish and CC of the heads because your compression ration is going to drop if you use stock dish pistons in it's forged counterpart. 7.8:1 or 8.6:1 IDR which, is what you'd end up with with stock pistons and a conversion.
With 14lbs you're going to need at least an in tank 255 and a supporting 255 or KB BAP. (My dual 255's have gotten me to 600ish)
If you're getting non I/C and you're running 14lbs you better have meth. (Or water or anything for that matter)
You'll need a 6pt cage to be track legal IF you reach the track times that require it.
I always say start with 60# injectors. If you're buying them why not buy the max injector you'll predict to ever need when they are almost the same price. I paid $333 for mine through Kurgan Motorsports. If for some odd reason you buy 42's and your pumps start reaching their max a bigger injector can help tune through he problem allowing you to safely reach that number you want.
09-29-2009, 09:25 AM
#4
1st Gear Member
Thread Starter
Join Date: Oct 2008
Location: PA
Posts: 56
Ive had seanhylandmotorsports tell me to go with 42lb injectors. Ive had blowbyracing tell me 60lb injectors... etc... im just not sure. I was hoping somone has done most of these mods and can straighten this out. The reason Im going with B heads is because they are one of if not the best flowing heads for a 4.6. They flow better then C heads if i recall and the supercharger/computer is ment for the B heads - less problems.
09-29-2009, 10:29 AM
#5
6th Gear Member
Join Date: Feb 2006
Location: Virginia
Posts: 11,786
Definitely go with 60# injectors. You'll need at least a 255 in tank and either a KB BAP or an additional 255 in line pump. Bigger injectors can help the tuning If for some reason you start to run out of fuel and will help dial in the numbers.
Make sure you get the correct Dish pistons. adding pistons that are the same dish as the 2v will lower your compression way down so make sure everything's matched according to your goal.
Make sure you get the correct Dish pistons. adding pistons that are the same dish as the 2v will lower your compression way down so make sure everything's matched according to your goal.
09-29-2009, 11:19 AM
#6
5th Gear Member
Join Date: Nov 2007
Location: Maryland
Posts: 4,955
^ good point on the compression, +1 to all the fuel stuff.
O.P i have a cobra intake for sale, you won't need the upper but idk if i can separate. :\
Its a takeoff from my car, im going C heads thus my "B" style intake cannot be used.
If you're interested PM me an offer.
O.P i have a cobra intake for sale, you won't need the upper but idk if i can separate. :\
Its a takeoff from my car, im going C heads thus my "B" style intake cannot be used.
If you're interested PM me an offer.
09-29-2009, 03:07 PM
#7
1st Gear Member
Thread Starter
Join Date: Oct 2008
Location: PA
Posts: 56
sxynerd - yes I know about the compression rating. I am going with the Manley 11cc dished pistons. It will give me a compression rating around 9.2-9.4 : 1. Kenny bell recommended this compression to get best results. And thank you about the fuel pump.
The reason I wasnt sure about meth injection is because seanhylandmotor told me that in all the years they have delt with KB as long as you get a good tune you dont have to worry about detination. They claim they have run 17 psi set ups on non intercooled versions and never had one returned yet.
The only reason its non-intercooled is because it sits directly on the engine bay. The air goes directly through the intake to the KB. No one makes a intercooler for this set up.
SVT - thanks for the offer but im going to put a steeda aftermarket intake on it. This motor will be built, its just coming down to the money factor at the moment. But slowly I have been getting it togeather.
The reason I wasnt sure about meth injection is because seanhylandmotor told me that in all the years they have delt with KB as long as you get a good tune you dont have to worry about detination. They claim they have run 17 psi set ups on non intercooled versions and never had one returned yet.
The only reason its non-intercooled is because it sits directly on the engine bay. The air goes directly through the intake to the KB. No one makes a intercooler for this set up.
SVT - thanks for the offer but im going to put a steeda aftermarket intake on it. This motor will be built, its just coming down to the money factor at the moment. But slowly I have been getting it togeather.
09-29-2009, 03:15 PM
#8
6th Gear Member
Join Date: Feb 2006
Location: Virginia
Posts: 11,786
sxynerd - yes I know about the compression rating. I am going with the Manley 11cc dished pistons. It will give me a compression rating around 9.2-9.4 : 1. Kenny bell recommended this compression to get best results. And thank you about the fuel pump.
The reason I wasnt sure about meth injection is because seanhylandmotor told me that in all the years they have delt with KB as long as you get a good tune you dont have to worry about detination. They claim they have run 17 psi set ups on non intercooled versions and never had one returned yet.
The only reason its non-intercooled is because it sits directly on the engine bay. The air goes directly through the intake to the KB. No one makes a intercooler for this set up.
SVT - thanks for the offer but im going to put a steeda aftermarket intake on it. This motor will be built, its just coming down to the money factor at the moment. But slowly I have been getting it togeather.
The reason I wasnt sure about meth injection is because seanhylandmotor told me that in all the years they have delt with KB as long as you get a good tune you dont have to worry about detination. They claim they have run 17 psi set ups on non intercooled versions and never had one returned yet.
The only reason its non-intercooled is because it sits directly on the engine bay. The air goes directly through the intake to the KB. No one makes a intercooler for this set up.
SVT - thanks for the offer but im going to put a steeda aftermarket intake on it. This motor will be built, its just coming down to the money factor at the moment. But slowly I have been getting it togeather.
09-29-2009, 03:38 PM
#10
6th Gear Member
Join Date: May 2007
Location: Columbia, MO
Posts: 6,347
Ive had seanhylandmotorsports tell me to go with 42lb injectors. Ive had blowbyracing tell me 60lb injectors... etc... im just not sure. I was hoping somone has done most of these mods and can straighten this out. The reason Im going with B heads is because they are one of if not the best flowing heads for a 4.6. They flow better then C heads if i recall and the supercharger/computer is ment for the B heads - less problems.
i would go with the 60's between the two. as sxynerd already stated, its a good idea to have some breathing room with the duty cycle.