TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
Welcome to ThirdGen.org!
Welcome to ThirdGen.org.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!
I understand that NO2 now offers a plate style nitrous system specifically for the TBI V8. It comes set at 120HP and is adjustable. It goes for about $550. Of course I'm concerned about detonation and a potential meltdown. I Know I'm at 12 psi fuel pressure. I just ordered a MSD Coil and wire set. And I plan to return my timing to factory spec. The question is, if the computer O2 sensor detects a lean condition because of a greater concentration of air will it compensate by sending more fuel. If that's how it works it should be safe. Shouldn't it? Plus the thing has a knock sensor so that might provide some added insurance. If everything runs smoothly I should be achieving over 300 HP on demand. Sounds good to me! What do you guys think?
------------------
Black 1989 RS Convertible w/43,000 mi.
Excellent Condition
LO3 305 w/TBI
12 PSI Fuel Pressure
6* Timing Advance
Open Element 14x3 K&N
Hypertech Thermomaster
160 Degree Thermostat
Low Temp Fan Switch
Eddlebrock RPM Muffler
No Cat/No AIR Injection
B&M Stage 2 Shift Kit
17"x8.5" ATP 5 Spoke Alloys
P 245/45 Goodyear Eagle
HP Ultra Plus Tires
Lakewood Control Arms
Lakewood Pan Hard Rod
Coming Soon:
3.73 Gears
Headmann Headers & Y Pipe
MSD Wires and Coil
Sounds fun to me but I'd post on the power adder board. Also if you're running with stock cast pistons then you're asking for trouble. Although people have been running 125hp on TPI setups. I don't know though, if it were me I'd make sure I had forged crank and pistons before doing any power adders. If your car isn't a daily driver then go for it but be ready when the car craps out on you
------------------
, Jon (91 RS too many mods to list), getting new engine in summer
Thanks for the input. My Brother in Law warns me that the lower end wont hold up but I've heard from some reliable sources that the stock bottom end should be good for up to 400hp. My car only has 42000 mi on it but it is 12 years old now. I wonder if things like valve seals and head gaskets should be a concern simply because of the age of the vehicle. I'm tempted to just roll the dice and see what happens.
------------------
Black 1989 RS Convertible w/43,000 mi.
Excellent Condition
LO3 305 w/TBI
12 PSI Fuel Pressure
6* Timing Advance
Open Element 14x3 K&N
Hypertech Thermomaster
160 Degree Thermostat
Low Temp Fan Switch
Eddlebrock RPM Muffler
No Cat/No AIR Injection
B&M Stage 2 Shift Kit
17"x8.5" ATP 5 Spoke Alloys
P 245/45 Goodyear Eagle
HP Ultra Plus Tires
Lakewood Control Arms
Lakewood Pan Hard Rod
Coming Soon:
3.73 Gears
Headmann Headers & Y Pipe
MSD Wires and Coil
NO2 System
I have the 125 hp nos kit on my tbi 305. Before it i ran a best of 15.9 and after i ran a 15.3. This was with a cold bottle in 60 degree weather since then i got a bottle heater and i want to see the time difference. This was on stock tires and a 3.73 auburn rear with auto. I have had 8 bottles in my stock motor and i havent had any problems except melting my plugs. If you do use it go with r42ts plugs because they wont hold the heat. I also have a hypertech thermo chip on my car.
<font face="Verdana, Arial" size="2">The question is, if the computer O2 sensor detects a lean condition because of a greater concentration of air will it compensate by sending more fuel. </font>
No. The reason is, the ECM ignores the O2 during WOT operation (the only time NO2 should be activated).
Thanks for the help. It's good to know I need cooler plugs. Prevention of damage is what I want. Also, I'm suprised to hear that the O2 sensor doesn't have any effect at WOT.
So Should I increase fuel pressure? Do I want larger injectors? Am I missing something?
------------------
Black 1989 RS Convertible w/43,000 mi.
Excellent Condition
LO3 305 w/TBI
12 PSI Fuel Pressure
6* Timing Advance
MSD Coil And Wires
Open Element 14x3 K&N
Hypertech Thermomaster
160 Degree Thermostat
Low Temp Fan Switch
Eddlebrock RPM Muffler
No Cat/No AIR Injection
B&M Stage 2 Shift Kit
17"x8.5" ATP 5 Spoke Alloys
P 245/45 Goodyear Eagle
HP Ultra Plus Tires
Lakewood Control Arms
Lakewood Pan Hard Rod
Coming Soon:
Hedman Headers & Y Pipe
12 Bolt With 3.73 Gears
NOS System
yes you are. you forgot to notice that the nitrous kit comes with a nitrous jet and a fuel jet. It injects extra fuel from you fuel line and also nitrous at the same time.
------------------
91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 224/230 duration and .477/.480 lift. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, 3000 stallconverter. Edelbrock TES, 3inch cat, flowmaster with single 2.5 inch exit.
Best time yet to come
12's?? :crossthumbs:
So there are two solenoids included with the kit.I assume that they are linked so that the nitrous will not kick in unless there is adequate fuel pressure to the fuel solenoid. So Running too lean should not be a problem. Has anyone used an adj. ignition timing control. Any reccomendations? Also does the LO3 have a rev limiter or is an MSD box or equivelent necessary?
Camaroracer1992, you only got 6 tenths on the ET with 125hp NO2? You had 3.73 posi rear, that with a good running 305 TBI would run in the low 15's. What was your end mph? What was your reaction time. 2 seconds? Sorry but if with 125hp no2 you should be in the 14's no doubt.
------------------
, Jon (91 RS too many mods to list), getting new engine in summer
I'm going through this same deal AGAIN. I think I can get a healthy 305 w/ a solid 700 R4 and these mods: open element, full exhaust 3.XX gears w/ posi into the 13's w/ a 125 shot...what do you guys think??
ohh yeah....think about it. Let's say 200 HP on the motor......add 125, that's approx. 325>>>>that's like LS1 power baby!!!! Plus the suspension is built up decent and it hooks nice. I'm thinking upper-mid 13's here .
I'm guessing you'll get low 14's with street tires and 3.73 gears. Weight means a LOT when racing, save 100 lbs and you'll feel/see a difference. My friends 370hp 327 3.73 12bolt built is only 3100 and is running 13.1's all day. He just got some full roller rockers w/roller tip (magnum pro), hopefully he'll get into the 12's. Also remember the 125hp shot isn't exactly like a real 325hp engine, close but not the same. I'd be very happy with high 13's. I wish this site had a place to see where peeps had all there mods listed and specs. I'm thinking about doing this.
------------------
, Jon (91 RS too many mods to list), getting new engine in summer
Whoa buddy, you don't want to be running a performance chip with nitrous, or a lot of advance, as these both cause detonation (performance chips tend to advance timing). Make sure to get a nitrous controller like the one from Jacob's Electronics and read FAQ's from NOS. Good Luck
hey whats up ! Just bought same kit you have, purchased from indy auto parts for 524.99. I almost have same mods as you as i have conv. rs too. We weigh a bit more but we look cool with top down. What do you have for e.t.a. in 1/4 mile? Did you try those plugs that dont retain heat as suggested? How much? Where can i get them? Stay in touch jeflpz@aol.com good day!!
<font face="Verdana, Arial" size="2">Let's say 200 HP on the motor......add 125, that's approx. 325>>>>that's like LS1 power baby!!!! Plus the suspension is built up decent and it hooks nice. I'm thinking upper-mid 13's here!</font>
No offense guys but do you guys even know anyone with a 305 TBI that has a nitrous kit on it and what they run in the 1/4 mile? So far, I see one 305 TBI with a nitrious kit and times and he runs a 15.3 with a 125hp shot! Yeah it was cold out but it still....
Isn't there anyone with the NOS kit on their car now besides camaroracer1992 that runs good times? If not, then I would never suggest putting an NOS kit on our 305 TBI's then, cause for 600 bucks you gain .6 tenths? Yikes....
Sorry guys but I think a lot of you need to do some more reasearch on different modifications to your engines before you go and spend crap loads on stuff.
uhh.....I don't think some of you understand. I do this junk for a living right now......I don't really spend much if anything on parts and crap like that. I have a healthy 305 sitting around.....I bought the kit for my 327 and carb set-up. Yes the way I got the kit is for TBI.....but...again, I can easily set it up to work w/ my Holley. This is just me tinkering around b/c I want to know. So chill w/ the wasting your time and money stuff b/c I personally am not. SO FOR THE RECORD.......I DO NOT GO OUT OF MY WAY TO MOD THIS 305...I DO HOWEVER FOR THE 327. I RUN A 13.7 ALL DAY W/ THE 327 AND CARB/INTAKE SET-UP. I HAVE NO IDEA WHAT IT RUNS W/ THE TBI THAT'S ON IT NOW. THIS IS MY SITUATION. LATER
Say your 305 puts out at least 200 hp; 125 hp shot of nitrous would in some cases add more than 50% to your horseposer bottom line. I want to know how that relates to the streets. with somewhere in the neighborhood of 300 hp I would think you could beat most of the cars you would face. I mean Mustangs and turbo eclipses and such. I want my car to be a lot faster in a short time with not as much time and money invested as I would have with a crate motor swap. But, I don't want the thing to blow up. so if any of you have had success with the TBI plate style system let me know what to expect. Thanks
Just because it says 125hp shot, doesn't mean your getting 125hp to the engine. You have to do it right and I think that example is proven in camaroracer1992's car.
BTW: ChevyBoy, I was talking to everyone else not just you. Thats great that you do all that, I don't really care, but for everyone else its kinda important.
I'm thinking I can make 270-300 HP. At least 250 HP at the rear wheels is what I would expect. You could take out a lot of mustangs with that. Traction becomes a lot more important. That and tunning eyerything to work it's best.
------------------
Black 1989 RS Convertible w/43,000 mi.
Excellent Condition
LO3 305 w/TBI
12 PSI Fuel Pressure
6* Timing Advance
MSD Coil And Wires
Open Element 14x3 K&N
Hypertech Thermomaster
160 Degree Thermostat
Low Temp Fan Switch
Eddlebrock RPM Muffler
No Cat/No AIR Injection
B&M Stage 2 Shift Kit
17"x8.5" ATP 5 Spoke Alloys
P 245/45 Goodyear Eagle
HP Ultra Plus Tires
Lakewood Control Arms
Lakewood Pan Hard Rod
Coming Soon:
Hedman Headers & Y Pipe
12 Bolt With 3.73 Gears
NOS System
do you really need to buy the tbi nitrous kit? isn't there a way to adapt it to a regular carb nitrous kit? there are numerous carb kits for sale everywhere, cheap.
91Bird: You said that there is hardly anyone that uses the kit and the only one who does gets bad results. Well I guess it's time to come out of hiding. I have had the NOS tbi kit on my car for 21/2 months and it works great. On the g-tech I run consistant 13.60s at 108mph and one freak 110mph run but I think that was a fluke. At 108mph with my car weighing 3450 that turns out to be 339.19rwhp(go to prestage.com) The mph is high for the e.t. because it only activates half way through 1st gear. I love it, there was a guy at my high school who has a 92gt 5.0 with intake exaust cam headers and stuff(I did all the work for him), when we raced and by 80 I had a good 5 car legnths on him. He was so mad but were still freinds. Hopefuly I can go to Famosa dragstrip on saturday to find out if my g-tech is accurate.
By the way I am running 14.8's at 96mph now naturally. I actually picked up 1 tenth and two mph after I had shot n2o a couple of times. That confused me maybe it clean the comb. cambers
By the way I am running 14.8's at 96mph now naturally. I actually picked up 1 tenth and two mph after I had shot n2o a couple of times. That confused me maybe it clean the comb. cambers
Wow! My car runs 14.91 naturally. It would really surprise the he11 outta some of my Mustang buddys if I showed at test n tune and pulled a 13.60 -13.80 Zac, do you plan on taking your car to the track for a "true" timeslip?? I'm not doubting you or calling you a liar, but 1.2 sec seems a little high for a 125 shot, but I'd love to see a timeslip saying that. Maybe the peanut cam likes nitrous since it hates HP so bad!! But seriously, if your car goes 13.60 - 70's at a track, please, let us know. This would be a cheap mod especially considering that a 125 shot is not terribly hard on the engine, if you don't spray the car all the time on the street.
yep I'm going after school friday to get a full bottle and then satuday morning to the track for some time slips. I myself was very unsure of my g-tech at first until I smoked that 5.0. Also remember that I have headers,no cat,and 3" all the way out to a flowmaster 80 series. Many have said it was too big for my car but the nitrous takes full advantage of that with the increased air flow.
Thanks for the input. Sounds like your getting the kind of results I'm looking for.
Did you get the kit designed for a TBI setup?
Will a carb plate work or do you need a plate designed for the 2bbl TBI? After my headers are in I figure I should be ready to install nitrous. Anyone else winning on the street with NO2?
You can use the carb plate but you have to use the tbi plate jets because the fuel jet is calibrated for tbi system(9-13psi) fuel pressure not carb(3-5psi)
I cant wait until March 31 come becaue then i can go to the track and test my car again. I ahve since added my bottle heater and a blanket for it and alo retardedthe timing a little. I know 15.3 on juice doesnt sound good but thta wawith street tires and they didnt hook up the best like it uually did before the n2o. Also i have a set of MT street lick coming from summit soon so i will have to see what it does now. There's always rom for improvement remember!
Yeah thats true. I can't wait to see what mine runs in the 1/4 mile too. I have never ran it stock or with all my mods on it like I have now. So should be a toss up.
a small shot of "spray" will not hurt the bottom end at all. i have run 125 on my 92 and has done just fine. just dont let the bottle go to your head and make you feel like you need to spray all the time. its a lot of fun but remember cast pistons frown on it a little. but if you get it set right, you cant beat it!!
Well, I'm running 125hp jets in my nitrous kit with no problems at all. I've melted one set of stock plugs, but thats taken care of now. On the motor it runs 14.80- 14.90, on the bottle with street tires it will run 13.70's if you've got a quick foot. It's worth the money when you consider the price of parts it would take to get that out of a stock 305 TBI.
Just an update......the nitrous has been shipped and it will be here this weekend or possibly Monday. I still need to figure out what my fuel pressure safety/shut off switch should be set at. Gonna hit the track soon and give very recent befor and after times along w/ before and after certain recent mods....i.e. control arms, slicks, etc. THIESE TIMES WILL BE FOR THE 305 "test" MOTOR.
good day!! 
But seriously, if your car goes 13.60 - 70's at a track, please, let us know. This would be a cheap mod especially considering that a 125 shot is not terribly hard on the engine, if you don't spray the car all the time on the street.
