More Power

Using the speed/gear calculater (that was posted earlier) it says you should reach 170 mph at 8000 rpm. That is with a 4.10 rear end. You could change to a 3.9 and get 178 mph.

87GTR

iTrader: (61)

that is fast enough for me. can this trans take occiainal trip to the drag stirp?

twister

Yes, I run the transmission in my circuit car, and other guys I know run it on the track and the road. It was designed by racers for racing/dragging!

That is what Guru Motorsports is based on, street to track, all products I have seen have first been used on the track/strip and then 'migrated' to the road usage.

87GTR

iTrader: (61)

great!!! when you order 1 do you get the new guts or a whole tranny?.

I dont have those mazda tools to gut the old tranny.

can you get seql shift patten for this also?

87GTR

iTrader: (61)

is exit13b tranny with the H pattern shift or is it seql shift?

twister

Hi
The shift pattern is:

R 2 4
1 3 5

Sorry, what do you mean seql shift?

The kit is the 'guts' as you put it, but you can ask for them to put it in a case if you wanted (obviously they would charge for the case if they supplied it). Someone from the US did a while ago actually ship their case over, but you pay for the shipping from the states etc.

Look, any decent tranny place can do it, and it would not ciost that much, to actually put a dog gear set in is much easier than a standard set because of no syncro's etc.

FYI, Rohan Ambrose is in Dallas on this Thursday and Friday (9/10th May), visiting I think Bobby Archer (some one who racers vipers?) and some guy named Taylor who sells racing product. Now he has a gearset and Torsen with him, if you are around you should try and track him down, I may be able to find an address from his work if you are interested.



www.gurumotorsports.com

87GTR

iTrader: (61)

is there a reverse lock out so you cant go from 1st to R?

twister

Yes there is, I was a little worried about that myself!

The entire box has a lock out system to prevent you grabbing two gears and causing any damage, do not know how that could really ever happen but it will not happen with the lock-out system built in. the spring tension is great that just set-ups you up for the next gear, not sure how it works but it works like magic!

Crusader_9x

so whatr about street driving? would iut be way to much rouble to dri ve on the street? or is ti preety easy for street applications?

twister

It is real easy for street application, my brother has one in his FD and loves it, it is more noisy than a syncro box, but he and I love the sound! Except when you get to 5th gear, then it is silent as it is straight through, nothing to hold up the performance at all!

It is real easy to drive on the street, no hassles at all, every guys who has one I know love's it, because of the performance improvements is awesome on the street and strip.

Node

iTrader: (1)

Exit13b's tranny is sequential
twister: sequential means you shift up to shift up to 2nd, then slam it down real fast to get to 3rd, then slam it back up for 4th, and slam it down again for 5th
No misshifts and its very fast because its just a straight line up and down. I don't know how downshift or R works in it, I guess you just have to "reset" it.
It's a dragbox

87GTR

iTrader: (61)

Node all the sequential boxes I have seen
is pull back is shift up and push forward is shift down.

with the set up you described how would you shift down?

twister

Thanks for that NODE, real easy to understand.
Sounds great, a pity in our circuit race rules over here we cannot do that, that would be cool!

Node

iTrader: (1)

I don't know, I just know you can slam em back and forth, he can like pull it out (upwards) a little, and theres also a little pull up thing for your fingers. I have no idea. I'm sure crispeed knows how it works, I believe he has/had the same tranny.

Node

iTrader: (1)

Oh, and theres another type of sequential, which 87 GTR described, those are far more expensive. Although you can get an attachment to make them (forward to shift down, back to shift up). But it cost like $1000 or something silly like that, and its quite ugly. Although it's really tall which gives it the advantage of being very close to your steering wheel (like a rally setup)
Kinda like a tiptronic for a real manual.

twister

Having a long shifter near the steering wheel is great, I use it in my circuit car and with such a short throw to change gear you just take you hand of the steering wheel for a split second. If you see any of The V8 supercars inscar video (australian racing etc) they are all going this way as well. Funny that, since the guy who makes the GURU boxes also makes them for the V8 supercars! No wonder the gears and the shifters are the same!

LETHAL RX7

iTrader: (1)

Well the shifter node is talking about is called a v-gate. There is actually 6 gates in it and all they are is pretty much a slot. 1-5 and reverse. The little handle with the spring is to pull it back up into first gear. you start with it all the way up and forward for first gear and back for second so on and so on. The v-gates are on the race cars bc to drive them on the street would be a pain bc you need to pull up the arm and find the right gate everytime you would want to downshift. The guru tranny i beleive is just the same style shifter as in most factory cars and that is an h-pattern shifter. Honestly for the price i wouldnt buy a guru tranny i would buy a gforce road race one. They are actually cheaper for the tranny itself But you would need a new bell housing and some odds and ends but i think its a much better idea and it will not break and you can shift them clutchless. We have run clutchless gforces and the road race with can be shifted clutchless and with the hpattern shifter on it you can downshift at any speed..you could go from 4th to 1st and it will go in. So when i take my tranny out it is gonna have a gforce and best bet is to buy a v-gate for drag racing it and the h pattern for street driving or road racing. the reason i would go with the two different shifters is bc if you are wide open going thru the gears it is very easy to stuff it into first from secong rather than third. Hopefully i was able to help someone out and shed some light or somthing. Later

twister

Hi,
I do not think the Guru tranny gearset is aiming to compete with such boxes as a gforce that you build your car around as such.

Many drag & circuit /road rules do not allow you to change the gerabox case, that is where the Guru tranny gearset comes into its own. Many guys for the road also do not want to re-engineer there car around a box, that is why it is starting to gain popularity. Now people are starting to see the quality, realiability & strength. These guys make the gears and diffs for several of the V8 supercar teams here in OZ.

From what I have seen the gforce is not cheaper either but may be that is just in this part of the world?

Thank you for the info on the v-gate though, very interesting.

LETHAL RX7

iTrader: (1)

Not a problem with the v-gate info ill help anyone when i can. And yes in all my writing i left out the unless the car is being built around class rules then it is understood. Alot of work doesnt need to be done to get a gforce into a car but it also must bemakes sence to have it in there...hence class rules..but that guru box looks interesting. Greg

rx7tt95

Theoretically, could you use the Guru billet braces with the stock gear assembly? TIA.
Michel

twister

Hi, I do not see why not, the guys just do not market it I do not think, I am racing this weekend and Rohan will be there. I will ask him.

moespeed

Who is this guy who makes the gearsets?
Is it posible to get the gearsets straight from him?
I wish the price and ratios were a little different.

twister

The guy will not sell them to anyone but Rohan Ambrose, they have a water tight deal apparently.
What sort of ratios are you thinking and why?
Cheers.

moespeed

I really do not have the experience. I would love to draw on the experiences from guys such as yourself and do love your input. I am looking into getting the best setup to drag race in a street class with a series 4 rx7 that has a 500+ HP motor that may see 8500 rpm.
I love the idea of running a 1:1 fifth gear gearbox and using all five gears up the ¼ mile. Check the ratios for TFC11: http://home.att.net/~rotarymoe/Top_end_mph.html
The Guru gearsets seem to be straighter than any of the gearboxes out there. Makes me wonder if these gearsets are a bit overkill for an engine that may have little more grunt or a broader power band. I am also weary of the dead first gear. I wish the ratios were more like the SM1:1 gearbox. I wonder if first gear launches with the TFC11 box would put a hurting on single disk clutches.

twister

Hi,
Straighter, not sure what you mean, sorry?
I use the TFC11 for circuit use with a single plate 4 puck clutch without drama's. I produce about 250hp at the wheels at about 9200 rpm.

Dead first gear? The long first means you can have a fantastic takeoff and get the jump on many cars before having to change. I would never go back to having a short first again (well that is myself anyway).

For drag/street use I would recommend the TFCOD to get the overdrive 5th. Gearing also comes from the diff and wheels/tyres, so keep that in mind.

The ratios for the GURU box have been designed by the top guys in Australia (well many people think so) to always keep you in the powerband when you are changing gears, i.e. so you do not 'fall' out of your maximum power/torque point while also being the strongest gear manufactured you will find.
I will run the ratios you talk about through one of the simulation models I have and let you know what I think re the falloff between shifts.