UnderCover89TBI

iTrader: (25)

Mile high eh....daang so it is quite a bit faster than that. its amazing what altitude does!

community

yeah altitude sucks i used to live in california then moved out here and wow what a difference

thebuffalo

Good mod for a "pretty much stock" tbi is cutting a hole in the other side of your stock breather and running both sides down to your where your foglights are, remove the foglights and replace with mesh grille so nothing goes in there. I did this to my 88 trans am when i had my 305 tbi

the original stock intake is like breathing through a straw in a sauna

irishhockey34

iTrader: (12)

My TBI setup has seen a best of 13.6 at 102mph in the 1/4 mile. Vortec heads, GMPP intake, comp cam, 10:1, tune by TBI chips on a stock TBI @15psi

ninetyone

iTrader: (2)

nice!

UnderCover89TBI

iTrader: (25)

305 irish?

irishhockey34

iTrader: (12)

350 .030 over. Sorry i forgot to mention that. 700r4 with B&M shift kit and 2300 stall converter. LS1 3.42 posi rear

UnderCover89TBI

iTrader: (25)

my bad I think I declined to look under your name where it says 350...lol. good time though

BobbyRod

What kind of cam is that? lift? duration?

irishhockey34

iTrader: (12)

http://autocarsuperstore.com/product...ock-Chevy.html

for full specs

SKELITOR117

iTrader: (3)

. Sorry to interject, Funny stuff. I hate it when guys think their car is faster because they swapped to a carburetor. I had a Holly 4 barrel carb that would have been PERFECT for my 305 TBI. You know what I did? I sold it and bought a Hypertech TBI chip. BAM.

BobbyRod

Nice cam too! but why you retrofitted to flat tappet? cost maybe?

alvanwie

Excellent time, especially considering it has a rather small cam that should provide good street manners and mpg. WTG

robertfrank

iTrader: (27)

Damn thats a small cam,lol. You would've been better off with an LT1 cam with 1.6 rockers. Any reason why you didn't go bigger?

irishhockey34

iTrader: (12)

Mainly because I had the motor built when I was 16 and my dad didn't want my first car to be an absolute powerhouse. But it also had to do with street manners, fuel economy, and budget as I was paying out of my pocket for parts and being that the car would be my DD.

Yes, it is a smaller cam but that motor has seen one of the best 1/4 mile times from a TBI car on this board. Juts goes to show you, its not always about the biggest cam, rather the more suitable cam.

irishhockey34

iTrader: (12)

Thanks! looks like you have a very similar setup to me. Any 1/4 mile times or hp numbers on it?

alvanwie

Got a bit more cam, never been to the track or dyno, just a fair weather weekend cruiser.

pound

iTrader: (7)

Bringing this one back. I ran my heap again today. Best run was a 13.71 @ 104. My car is set up as such:

SBC 350
AFR 180 heads
LT4 Hot Cam (218 / 228 .525 / .525)
1.6 RR
Weiand Speed Warrior dual plane intake
2 inch bore TBI w/ 80lb injectors
T5 trans
Hooker 2055 shorty headers to 3 inch catback
All rear suspension upgrades
3.73 posi
Street tires

Car weighed in at a hair under 3500 with me in it.

UnderCover89TBI

iTrader: (25)

nice...good run...any video's?

SiCkRs

iTrader: (6)

How was it hooking up?

pound

iTrader: (7)

My friend supposedly got a video of the run. If / when I get it I'll post it here. I got a 2.18 60' so it wasn't hooking up all that great. I was also running street tires and I just suck at driving stick.

UnderCover89TBI

iTrader: (25)

yeah that 2.1 60' isn't great get that down and you got a low 13 in that car.

Fast355

iTrader: (2)

1983 Chevy G20 Conversion Van with full interior including sofa bed and rear a/c weighing in 5,600 lbs with me in the driver seat
350 TBI short block with 18cc dished pistons
1997 Vortec 350 cylinder heads, ported w/2.05 and 1.60" valves
Reed Custom grind camshaft, 214/218 @ .050, .520/.541" lift w 1.6:1 rockers, 114* LSA
Edelbrock Victor Jr 2bbl Vortec intake port matched
2" Marine 502 TBI unit with thinned throttle shafts and 30 psi regulator
Doug Thorley Tri-Y 315Y headers
2 1/2" dual in flowmaster Y into 3.5" with single in/single out Borla XR1 3.5" tail pipe
1995 Impala SS 4L60E rebuilt by me with Transgo HD2 shift kit, Corvette Servo, Performance clutches, wide 2-4 band, and Yank 2,800 rpm LT1 converter with 2.6 STR
Stock 3.08 limited slip differential
295/50R17 tires on Impala SS wheels
1995 G20 Van 7427 PCM re-chipped by me for the combination above

14.12 @ 99.86 on a 2.08s 60' at Ennis back in August 2007 in 2,500+ DA

one92rs

iTrader: (5)

what is involved in running this intake. what has to be done for the tbi to fit on it.

pound

iTrader: (7)

Here is a video of the 13.71 run.
Here is one from in the car. High 14 something and got off to a terrible start.

pound

iTrader: (7)

Fast if you got 5,600 lbs to trap 100 what am I missing? My car weighs over 2,000 lbs less and only trapped 104. I've been debating getting it on a dyno so I can really optimize the power. Its hard to do WOT runs on the street.

therobot

My 91 tbi has ultimate tbi mods, 3.42 gears with powertrax locker, headman headers with full 3 inch exhaust, udp, and lower control arms. I ran a 9.768 in the eighth with a 2.18 60'. I think I can drop my 60 foot with a set of lower control arm brackets cause I could only launch around 1000 rpms without getting major wheel hop. Hopefully I'll have new times this spring since I should have a lt1 cam in by then

Street Lethal

iTrader: (16)

I seen this car at the track. Nice trap speed, just need a stronger launch to reach 12's...

pound

iTrader: (7)

Thanks, I probably do have the MPH to touch high 12's, but that would require a drag radial or slick. I have a 10 bolt in there with 3.73's and am too afraid to run anything but street tires. Maybe one day I'll get a better rear in there.

Fast355

iTrader: (2)

Single plane intake manifold, probably lacking some in the tuning, and perhaps restricted by the single 3" exhaust. What are you running for a muffler?? Please tell me its not some crossflow design. If so install a cutout and pickup atleast 15-20 RWHP. Over 400 flywheel HP, you need a 3.5" exhaust IMO or atleast 2.5" if you are running duals. I would ditch that dual plane and run a victor jr 2bbl intake, open up the plenum and add a TBI adapter on it. I bet you gain 40 hp @ 6,000 rpm with zero sacrifice in low-end torque. With your 5 spd and 3.73 gears it will be hard to shift quick enough to run the kind of trap speed my highway geared automatic could pull.

I have always had best luck tuning fuel and timing at the track. Keep your timing conservative and work on your fueling. With a wideband that has external inputs its not bad to tune logging on a laptop. I ran a wideband with 4 external inputs and tied into the map sensor, tps sensor, engine rpm, and knock sensor. The sample rate was much faster than the stock ecu but comperable to the EBL if you have it.

If you want I can take a look at your tune and datalogs if you have them and see if anything sticks out. The TPI guys have figured out the AFR heads like a LT1/LT4 like timing map, if its not a good timing advance map it will sacrifice a substantial amount of power.

pound

iTrader: (7)

Thanks Fast. I am running the Hooker 2055 shorty headers. They are 1 5/8ths primary tubes to 2.5 inch collectors and a 3 inch Y pipe. After that, I have a 3 inch cat to a 3 inch cat back and a Hooker Aerochamber muffler. I assume the Aerochamber is a crossflow design since I can't see through it like you can with a glass pack.

As for the intake, I really did consider going single plane, but I was concerned with driveability. I saw a few reports of ice building up on the TBi using unheated single plane manifolds during mild or cool weather. This is not my DD so its not a huge deal, but if I had to take the car out on a cold day I didn't want this to be an issue. I may still go single plane at some point in the future though.

I do have an EBL datalog from my 13.7 run and have posted it here - https://www.thirdgen.org/forums/post...-post2228.html. I'd be grateful if you could give your opinion. I think there is definitely something out of place there. The biggest thing I noticed is the bouncing AFR at WOT. From the line of questions people were asking me in that thread they seem to suggest people think it is a WB connection issue. I have my doubts about that though.

seanof30306

iTrader: (4)

Bringing an old thread back to life:

That's a nice car, but I have a few questions. Why the AFR 180s for a street car, especially with the cam you're running? That's an awful lot of head (and runner length) for your setup. I'd really like to see what you could get out of those heads with more cam and a singe plane intake.

For a car with street tires, I think you have too much gear. A lot of people on here will disagree with me, but your 60' times and the video of you spinning the tires so much would seem to agree with me. The problem you face is, if you put drag radials or slicks on it, you'll be putting your T5 at risk.

You said you'd be looking to upgrade your rearend at some point. If it was me, I'd go 9" with no more than a 3.55 gear. I've seen a TPI Camaro drive over 100 miles to the track and run low, low 12s, with 1.8 60' times, with everyday street tires and a 3.27 gear.

I'm not making anywhere near the power you are, but I LOVE my 3.42s. I still get 25 mog highway, and have 60' times in the low 2s.

pound

iTrader: (7)

Thanks, I went with AFR 180s and the LT4 hot cam because I was being conservative with my head and cam combo as I need the car to pass emissions until I can register it as a classic in my state. From my research, the California TPI guys were getting cars to pass emissions with Cams slightly larger than this and AFR 195s. TBH I was actually on the fence between 180s and 195s when I was looking at heads and really don't think they are over sized for this application. If I do another build in the distant future I will probably get at minimum a 195cc head. I've considered moving to single plane also with my current setup, but that would mean a lot of time spent retuning and there seems to be debate out there on the gains of moving to single from dual plane for motors below 6000 RPM.

With the 3.73 rear and a trap speed of 104 MPH running a 26 inch tire will put me going through the traps at just under 5000 RPM. I had a 3.23 on there for a while and it ran low 14s with something like a 2.2 60'. I think a lot of it is that I just suck at launching the car. Here is my excuse for the terrible launch from that in car video - first run of the day and my first run with the 3.73s so I wasn't really sure how much I could push it. Obviously that was too much

The T5 has the G-Force gear set and case. I feel the weak link at this point is the rear. I put a support cover on there just for fun, but I don't trust the rear to survive a good launch with sticky tires. Eventually I'll put a 9" or Moser or something in there. I'm not gonna waste any more money on the 10 bolt.

I also recently found and fixed a pretty sizable vacuum leak which, based on the datalogs, looks like it was present the last time I went to the track. I'm hoping to improve on my time this season, but we'll see.

-AO-

I ran a 12.9 @ 105 1.8 60'. 350, Dart 180, Vortec cam, 1.65 RR, 3000 stall, 3.73, Holley 700cfm Avenger TBI.

RBob

iTrader: (1)

Pound, see the Tuning with the EBL thread, I responded to your post that you linked above.

RBob.

seanof30306

iTrader: (4)

Nice, but that's a 4bbl throttle body with 4 injectors, isn't it?. What we've been discussing/debating all these years is doing it with a 2bbl throttle body, 2 injectors, and a factory ecm. A well set-up car with 330-350 hp would be able to do it, so it is theoretically possible.

Since embedded lockers allows for 4 injectors, You could use a 4 bbl throttle body with 4 injectors with the factory ecm, but the mythical unicorn on this forum has always been a 12 second 1/4 mile from a 2 bbl TBI.

Also, to get those 60' times, what tires were you running?

-AO-

My tires are 275-60-15 Nitto 555R drag radials. I've pulled a few 1.7's with them.

IVIitchell

i have a quesiton for you, what "Bolt-ons" do you all have for you tbi

Dewey316

Been forever since I posted on TGO.

I ran a 13.1 @ 107 with the help of some spray, and a 14.0 @ 96. I have never getting better than 2.1 60' time with my car.

Of course a search for my user will give you the entire build, the short story is. Stock 305/T5 combo, 3.42 posi, ported 416 heads, single plane, 454 TBI, cam, and a lot of old school tuning (before EBL), in a full weight Camaro.

Fast355

iTrader: (2)

One can get 320 HP out of the factory TBI unit and probably closer to 350 HP if you built the engine at 11:1 compression with nice restrictor plate type of camshaft.

VA454SS is running 12.43 @ 106 mph from a vortec head 496 powered 454SS truck and I am fairly certain still has his heavily tweaked 2.3" bored 454 TBI on top.

Remember that Edelbrock TBI to MPFI setup that nobody had love for.......There is a guy that has run 12.91 @ 105.85 with it on a 406, with edelbrock centerbolt performer style heads in a heavy truck.

Fast355

iTrader: (2)

Dewey! Its been forever man.....I know you didn't keep the car long after the 416 swap, but how much quicker where you able to run with them compared to the 187s?

Sadly your car was likely a 2,600 stalled 700r4 away from running mid 13s on motor and mid 12s on N20.

seanof30306

iTrader: (4)

Dewey, you should have been in my list of the people who could put a street TBI in the 12s on horsepower. Sorry I overlooked you. I'd bet you definitely have the quickest L03 in the community.

Where were you when I was trying to help the neighbor kid swap a 350 into his Camaro?

Dewey316

Hey Fast! I still have the car, its still running TBI for the moment (although I started getting pinion bearing noise, so it has been sitting until I pull the rear axle and press new bearings on), I'm going to be doing a 6.0 LS / T56 swap and finally getting it painted.

I picked up about 0.7 in the 1/4 between the heads. I only put it down the strip a time or two with the 187's and the cam, so I didn't really get a chance to dial in the tuning for it. I probably could have picked up a tenth or two with the 187s and a hair more work, so figure realistic, it was about a 1/2 second gain.

I was around, just not really on TGO. I took a break for a while due to some politics on the board. I was and am always hanging out on my local club's board.

irishhockey34

iTrader: (12)

If nitrous counts, I had my car run 12.8 @ 113 on a 120 shot, if I remember correctly. I would have to dig up the time slip to confirm

UnderCover89TBI

iTrader: (25)

well I know I will be in the 13's. Don't know where. if getting into the 12's would make me a famous person with a 2bbl tbi well **** I wanna do it!

irishhockey34

iTrader: (12)

It also looks like a lot of guys here are making the power, but just aren't hooking up. I'm seeing a lot of 2+ second 60' times. With spohn LCA/panhard, 4th gen rear, and M/T Drag radials, I was cutting 1.8 60' all day long

iroczracer07

iTrader: (2)

Yeah, 2.1 60' times seem to be the norm. There was a poster on the very first page that asked about what Kind of power the stock 305 T.B.I. unit would support. I'm sure Fast355, Rbob or Dewey has the answer, but I don't know it, lol. If one of you guys wants to chime in I'm sure he'd appreciate it. If he's still following the thread that is

Dewey316

Yeah, it is a really common 3rdgen thing. I know there is more in mine, but I really built my car to be a track day and auto-x weapon, not a drag car. I have very very stiff, very low suspension, manual trans, and huge brakes. Even my cam choice was meant to have lots of torque available through the rev range for pulling the car out of corners. Knowing the 10bolt is really the weak link in car, I have just never wanted to put drag radials or anything really sticky on it for a hard drag strip launch. I do the drag races for fun and hanging out fellow car guys who like to drag race.

As to the max power a 2bbl TBI will actually support, the guys like fast are the ones who will have better info on that. I can tell you that my car put 240hp down to the rear wheels on a dyno N/A, anything beyond that you'll have to look to the larger displacement guys with a lot more power.

UnderCover89TBI

iTrader: (25)

I cut 1.8 60' with my vigilante stall, 3.42 and drag radials I thought it was pretty good

pure1959

i just got an l03 with a t5 all std, and just removing the stock air filter has made a difference. Its not fast fast but you get great mpg, planning on a few mods, lt1 cam and some headers that should see 200 hp i think? Not too sure i woulld junk the TBI i LIKE IT!