sp361t

last time i was at the track i ran a 13.05@110 the best time i have every ran. my setup is a 383 with a 219 cam, 113 heads (mild port) stock TPI and stock exhaust manifolds with true duels and flowmaster mufflers.

I felt the 13.05 was a very good run especial with poor traction off the line (2.0 60Ft).

i am currently in the proses of switching to a LT1 intake and hopefully this will put me solidly in the 12's.

i was just curious of the difference when changing from the TPI to the LT1 intakes from the guys who have done it. Did you see a big change in loss of low end torque or was the loss not to noticeable and just saw an improvement in top end performance?

Thank you

TLS_Addict

Hey man, if you want 12s just throw some good tires on it and you have it. You have plenty of MPH to be deep in to the 12s.

Figure a good set of tires can take off .1 - .2 from your 60 foot which means .2 - .4 off your time.

sp361t

yea i know i am running nitto 555 right now and i do have a set of mickey T's but with the 6 speed i am worried about tearing something up, with being this close and not having everything done to the motor that i want (intake, headers) i think i will leave the mickeys off of it for now, i might get frogie and put time on for one pass though.

TLS_Addict

Which version of the Nitto 555's though?

I was cutting 1.90's with a stock LS1 GTO anda 6-speed on them at full pressure.

You wont tear anything up if you dont just clutch dump. Also, you have a Dana 44 so you wont tear that out either.

What type of burn out are you doing?

gerardvg

My 85 with just headers cold air intake and adjustable fuel pressure regulator set at 45 psi and a tune up did 13.4 quarters before i put the blower on so you need better tires for sure
She is now heaps faster with 8 psi boost and 383 bottom end just less tractable off the line.

A mini ram set up should help you with a wilder camshaft profile, no need for a hot cam with the TPI setup as she will choke past 5,500

If you want to rev to 7,500-8,500 yes go mini ram, if you do not want to go past 6,000 keep the tpi and get better tires / diff gearing to hook you up better. remember usable power tpi mild camshaft 1,200-5,500rpm Mini ram and wild camshaft 4,000-8,500
so decide if you want a road car or race car.
I had car in the past that would rev to 8,500 rpm but was a pig to drive on the roads.

Tom400CFI

I don't know any stock TPI intakes making usable power to 5500. OP said nothing of an aftermarket TPI. Conversely, I don't think you need to be going to 8500 to see the benefits of a mini ram, either.

OP: Work on your burn out and launch. You should be able to go sub 2.0/60' with your current set up and that will get right into the 12's. I agree that your 110 trap is additional evidence that your car has a 12 in it.

JackDidley

The LT1 intake should do it. I tried all sorts of stuff looking for 12s with a TPI. Miniram took me from 13.1 to 12.80. LT1 intake is very similar.

TLS_Addict

Why not use an LT4 intake or an Edelbrock LT4 Air gap if you are going to do it? They are even better yet.

sp361t

i know the car as a 12 in i did pull a 1.94 short time earlier but i only ran a 13.3 because i did not have my tune correct.

my goal is not to have a 8,000 RPM motor but a good solid mid range (6000 RPM) engine that with the Nitto 555 street tire can lay down a steady 12 second pass and i think the LT1 intake will do that epically for the cost compared to the aftermarket intakes.

also with switching to the LT1 intake i think that will help curb the low end torque and possible help me maintain a better short time (sub 2.0) because of the lack of a drag slick.

TLS: i am using the LT1 intake because i already had it, agreed i think if i was going to buy one it would be cool to convert the edelbrock LT4 intake.

TLS_Addict

Good option.

You will suprise A LOT of people with that car at the strip, that is for sure.

C4's are sleeps because nobody thinks of them as fast anymore.

TA

Easy 12s with good traction. I'd even say mid 12s and maybe lower on a good weather day with that MPH. With my old TPI motor I regularly went mid to high 12s at 106 or so. Now, I do have an auto trans with a 2500 stall TC, so that obviously helps me get off the line pretty well. That being said, I still see no reason your car isn't capable of mid 12s with that MPH. BTW, go with the MT drag radials


Coincidentally, my new engine sounds virtually identical to your's (383, 219 cam, ported 113s). I've only gotten to the track once so far, but it went 11.96 at 114 on the second pass and that was in July (hot). I'm hoping for mid 11s with the cooler weather..........any faster I'm gonna get booted off the track

TLS_Addict

Most of the PA tracks do the 11.50 and up no cage. lol

sp361t

TA: your getting me excited now talking about an 11 second pass with 113 heads i still need to get headers and the intake installed to let this 383 breathe

if i get to the point were i feel that tires would sink me into the 11's i would not be able to resist putting them on, breaking parts be damned lol.

sp361t

TA: what intake do you run? what RPM are you twisting?

bjankuski

I switched from the big tube long tube runner design TPI to the superram and picked up 38 RWHP with no other changes on a 355 with the 219 cam and 195cc trick flow heads. The car appeared to have no loss of low end and ran more then 1/2 second faster in the 1/4. I then switched to a modified lt1 intake and picked up 22 more RWHP over the superram and the car felt just as strong on the low end hit but in the 1/4 it did not run any faster. Almost identical ET's between the superram and LT1 intake with all other things being the same. The car was a full weight 1986 and it ran 11.82 at 114 MPH on its best run with this combination. I would assume your 383 with the 219 cam and good heads could equal that.

bjankuski

There is a lot of disinformation in this post. The lt1 intake is a fine street manifold, its power range is idle to 6500 RPM. These manifolds will not support 8500 RPM since they are too small to suppy enough air to a 383 at 8500 RPM. My 406 with the LT1 intake and ZZX cam peaked its torque at 2800 RPM and HP peaked at 6250 RPM. The manifold has a very flat torque curve that makes good power everywhere. It is designed as a anti-tuning system which means it does not use wave tuning to create the highest torque numbers or power numbers but it does make good all around power. The manifold runner lengths are actually tuned for 9200 RPM but the manifold is not capable of opeating at that point since it cannot flow enough air to support an engine operating at 9200 RPM.

TA

I have an Accel intake and AS&M runners. I haven't touched the governor in the trans so it still shifts at stock shift points........around 5200 or so I think. Believe it or not the dyno of the new engine shows it making power all the way to 6k, so I'm thinking I might benefit a bit from bumping up the shift points.

I wouldn't be too concerned about breaking stuff. You should already have a D44 in your car. Obviously stuff can still break, but at our power levels I wouldn't be overly concerned. I have very few issues since I put in the D44 and that's with 60' times in the 1.6 to 1.7 range.

TA

I've only ever run at NJ tracks (Etown/Atco) and both are NHRA tracks (sub 11.50 requires a cage).

TLS_Addict

Come up to Beaver and run with us. Be prepared for a .2-.3 at a minimum loss in your times. lol

rlane5

I have done a LT1 conversion, and pick up .5 and 5 MPH with mine. What gears and converter do you have?
Randy