speedtech nitrous

[doctor408]

can anyone tell me anything good about speedtech? i bought a SS diffusion plate kit and get get any sucess out of it.....and the installation was pittiful. nothing went right.... thanx for any input

[1320quick]

My buddy has a two stage SpeedTech diff plate on his 406ci small block. He loves it! The car has been 9.21 at 151mph using that plate. He picked up 4 tenths going from his old plate setup to this one. Sorry, can't remember what he took off it. I don't remember him saying anything about it being difficult to install. What went wrong with the install? What do you mean by not getting "any sucess out of it"? The more we know, the better we can help....

[John_Heard]

That plate is generally regarded as a pretty good one. Like all plates, you'll need to work with the tune up to get the most out of it.

[doctor408]

installation= they send spreadbore gaskets for a 4150 plate???? the butterfly's on my proform 950 would not clear the holes in the plate. i had to bevel the rim of the holes in the plate in order to open the butterfly on the carb. they said they would have fixed it but, i went ahead and did it. the selonoids (when bolted to the plate braket will not clear my carb, i had to relocate both seloniods. no a big issue, but dont expect to do that kinda stuff to a new kit ya no.. the nitrous seloid leaked at the top of the retaining nut right out of the box..they had to send me a new one. that is a lot of stuff to go wrong with a brand new kit.
performance= on a safe NX 200 tune up my car runs 6.01-6.09@115.
on speedtech 240hp it went 6.25-6.31@114-115mph. i played with the fuel psi and bttl psi and timming for 5 weeks. car pulls 1.36-38 60's on NX and 1.40-42 on ST.

[79 Camaro]

I have not had any of Speedtechs stuff, but I am using some NX stuff right now. I know that NX set there tune-ups very aggressive out of the box. Like John Heard said, "most" kits are usually pretty fat out of the box, to where you have to play with them some to get the most out of it. Not sure about speed tech stuff.

Can you give us the jet map that speedtech sent you? Maybe John Heard or I can plug the tune-ups into our computer and see what the N/F ratios are. Cant we John???

[John_Heard]

MPH on both plates is almost exactly the same, so it doesn't appear that it's down on power over your old plate. Like Adam said we can look the jetting you were running but I'm curious also if this was the factory tune up on the plate and if you did any tuning on it? Did you do any plug checks?

[doctor408]

i guess my fingers were moving too fast.. the mph on the speedtech was 110-111, about 4-5mpf off

[doctor408]

NX jetting= .82N and .73F. 1050bt psi,8.0 fuelpsi,27deg timming.
Speedtech= .82N and .82F 1050btpsi, 5.8fuel psi, 25 deg timming, that is what speedtech suggest as there 240hp, i went 6.28-6.33@ 110ish. i went as far as 5.0 fuel pis,and 28 deg timming and the best it went wasa 6.25. all this took place over about 5 trips at the track. put the NX back on with same tune up as before and went 6.04 1st pass,6.03,6.06 after that.does this help?

[ytnova]

Any chance you have weighed the bottle before and after each pass? This will give you a more accurate read on how much nitrous you are using in a pass. As far as the speedtech plate itself, I am using a two stage dominator diffuser and so far it runs about a tenth faster and 1-2 mph than my nx gemini using the same amount of nitrous, but I have yet to spray more than a 100 in each stage until I can get the rest of the chassis sorted out. My only real complaint is the damn selenoid bracket make the hoses look like a rats nest. You might call them and tell them your combo and ask them on some tuneup advice.

[doctor408]

i have talked to them several times on the phone about the situation and the best answer i get from them is "i dont understand it, i know our kit is the best". as far as weighing the bottle, NO i havent did that test on between the two, i know that would tell me the story but how accurate would it or i be? i would have to purge the same amount of time too. but just say i was using more on the NX than ST. so i ended up putting,let say<<<300 ST pills to use the same amount of Nitrous as the NX. does this mean im spraying a more potnent shot of gas, i dont know if my motor can handle a 300 shot? also, what is the purpose of the jet and tune up sheet if that was the case which i think is very possible.i know different motor are going to react different to nitrous as to the motors they were tested on but again, when they say to use this " " jet and fuel psi and it make this " " AMOUNT OF HP. I im kinda expecting to be real close to there claim u no? again, thanx for the reply's..keep'm comming.

[doctor408]

i also had the same prob with my bracket, in fact, my selonoids wouldnt clear my 2nd acc. pump on the carb. i had to completly re mount both selonoid else where. since then, i have purchased a wilson proflow SS plate and the installation was by far the cleanest,easeist,neatest i have ever installed.there jetting is also squared up like ST, but uses spray bars like most conventional kits. it will be a month or two before i go back to the track to test it though..'
It seems as if im doing a nitrous brand stand off doesnt it????lol
and i guess to some sort i am. i have tryied nos big shot, which was real close to NX stage six,which was 2-3 tenths faster than ST, to wilson ( not tested yet).

[John_Heard]

I think you would have to do some flow testing to see what's going on here with the difference between the two plates. NX Jets flow different than standard NOS type jets so I don't think you can directly compare them. I'd take a shot that the NX is moving more through a jet that is "labeled" the same size. I really don't think this is a matter of better or worse distribution, moreso in how things are labeled and the factory tuneups provided. I'm sure that the speedtech plate could run every bit as good as the NX with some tuning on it.

[doctor408]

i think the same.(NX is moving more nitrous through the same size jet).ST got all defensive when i suggested that i send both plate to the and flow them. anyway, it never was done. that was the last conclusion that i came up with also. to test it, the last time i went to the track, i removed .82 from the ST kit and installed .89 which by there paper was listed as a 300hp. with the fuel set 1psi lower and the timming set 2deg higher than ST recommendations, it went a 6.09@113. i took the kit off that night when i got home. that is almost the times i was running on the nx .82 pill.

[race9899]

What John said, with out flow to determine amount of fuel and Nitrous used with each plate you could not get an accurate judgment of the plates.

[doctor408]

i agree with that staement. BUT,,,,, would i be punishing my motor more with the NX .82 jet than the ST .82 since there is about 3 tenths between the two? also the speetech kit was 100-500hp. the .89 i use to run a 6.09 with was a 300pill. the 500pill was a 105. these tells me that this is a very inaccurate hp chart. cause if the ST 300 made what NX 200 (wich by the et were close) made, then the 500 would be more like a 375hp right?
also, the NX and nos hp chart to et records were real close,