Thread: Working On Gear Box With PAR For 2.3L and 2.4L VE Motors

I have been trying for damn near 9 months to have a gear set made and it is one bullshit then the next bullshit. Anyway the guy from PAR got intouch with me this morning again so I hope we are going to get somewhere.

Please take note of a few things. A 200-210 WHP SR20VE will roast tires from 2000 RPMS up to red line with easy and chirp the tires very hard and even spin them a bit depending on tire when going to 2nd gear.

I am trying to get something built more for the street.

Stock SR20DE 125 WHP

When looking at the longer 1st gear please take note that a properly done

2L VE will be making an average of 210-225 WHP or 69% - 80% more power than a factory DE.

2.3L VE will be making an avergae of 250-270 WHP or 100% - 115% more power than a factory DE.



SR20DE motor average ( factory )
86mm x 86mm 125 WHP @ 6400 RPMs and 115 LB Ft Torque to the wheels

SR20DE Gear Box, FD 4.176 on 23 tires at 8000 RPMs

1. 3.063----12.791 = 43 MPH
2. 1.826-----7.625 = 72 MPH ----- 4769
3. 1.286-----5.370 = 102 MPH ---- 5634
4. 0.975-----4.072 = 134 MPH ---- 6065
5. 0.756-----3.157 = 173 MPH ---- 6203


SR23VE motor average
92mm x 86mm 260-270 WHP at 8500 - 9000 RPMs 190 LB Ft Torque

FD 4.7 FD with 23 tires at 8000 - 8500 - 9000 RPMs ( great for the 2.3L guys making power at 9000 RPMs ) 92mm bore x 86 mm stroke = 2.285L


1. 2.20 = 53 MPH -- 56 MPH -- 59 MPH
2. 1.65 = 71 MPH -- 75 MPH -- 79 MPH
3. 1.32 = 88 MPH -- 93 MPH -- 99 MPH
4. 1.10 = 106 MPH -- 114 MPH -- 119 MPH
5. My choice



SR24VE Motor average 260-270 WHP at 8000 RPMs and 205 LB Ft Torque at 8000 RPMs

FD 4.176 with 23" tires at 8000 RPMs ( Great for the 2.4L guys making power at 8000 RPMs ) 92mm bore x 92mm stroke = 2.45L

1. 2.20 = 59 MPH
2. 1.65 = 79 MPH
3. 1.32 = 99 MPH
4. 1.10 = 119 MPH
5. My choice



This is the SER box with the samd 4.176 FD matched to the PAR gears with 4.176 FD.

FD 4.176 on 23 tires at 8000 RPMs

1. 3.063 = 44 MPH ----- PAR 59 MPH
2. 1.826 = 72 MPH ----- PAR 79 MPH
3. 1.286 = 98 MPH ----- PAR 99 MPH
4. 0.975 = 131 MPH ---- PAR 119 MPH
5. 0.756 = 174 MPH



Or


PAR with 4.4 FD 23 tires at 8000 or 8500 RPMs

1. 2.20 = 57 MPH ---- 60 MPH
2. 1.65 = 74 MPH ---- 80 MPH
3. 1.32 = 94 MPH ---- 100 MPH
4. 1.10 = 113 MPH --- 120 MPH
5. My choice




Another set of gear box ratios I was looking at and the guy at PAR like also.

4.167 FD on 23in tires at 8000 - 8500 - 9000 RPMs

1. 2.40 = 55 MPH ---- 58 MPH ----- 61 MPH
2. 1.93 = 68 MPH ---- 72 MPH ----- 78 MPH
3. 1.53 = 86 MPH ---- 91 MPH ----- 96 MPH
4. 1.20 = 109 MPH --- 116 MPH --- 123 MPH

4.44 FD 8000 - 8500 - 9000 RPMs

1. 2.40 = 52 MPH ----- 55 MPH ---- 58 MPH
2. 1.93 = 64 MPH ----- 69 MPH ---- 73 MPH
3. 1.53 = 81 MPH ----- 86 MPH ---- 92 MPH
4. 1.20 = 104 MPH --- 110 MPH --- 117 MPH

The gear box above might be best used for track use and might be the best combo for street to. Depending on FD it still has a 9 to 11 MPH longer 1st gear,

These thing can be manipulate more with tires either going to 22s or 23.5.


Would like to hear from CORY, DERM, Jamie Marsh AKA ( SR20GTIR ), Rocco Ciccone AKA ( Mr.sentra_specv ).

Just something to add to the list for me personally to look at.

4.176 FD 23 tires at 8000 - 8500 RPMs

1. 2.40 = 55 MPH ---- 58 MPH
2. 1.65 = 79 MPH ---- 84 MPH
3. 1.32 = 99 MPH ---- 106 MPH
4. 1.15 = 114 MPH --- 121 MPH

or

4.4 FD 23 tires at 8000 - 8500 RPMs

1. 2.40 = 52 MPH ---- 55 MPH
2. 1.65 = 75 MPH ---- 80 MPH
3. 1.32 = 94 MPH ---- 100 MPH
4. 1.15 = 108 MPH --- 115 MPH

or

4.7 FD 23 tires at 8000 - 8500 - 9000 RPMs

1. 2.40 = 49 MPH ---- 52 MPH -----55 MPH
2. 1.65 = 71 MPH ---- 75 MPH ----- 79 MPH
3. 1.32 = 88 MPH ---- 94 MPH ----- 99 MPH
4. 1.15 = 101 MPH --- 108 MPH --- 114 MPH

I like this option:

PAR with 4.4 FD 23 tires at 8000 or 8500 RPMs

1. 2.20 = 57 MPH ---- 60 MPH
2. 1.65 = 74 MPH ---- 80 MPH
3. 1.32 = 94 MPH ---- 100 MPH
4. 1.10 = 113 MPH --- 120 MPH
5. My choice

Looks like 3rd gear @ 9000rpm would also fit a properly built 2L VE making 210-215whp.



This would be my personal choice for my 2.4 and the "other" NA build we discussed.
4.167 FD on 23in tires at 8000 - 8500 - 9000 RPMs

1. 2.40 = 55 MPH ---- 58 MPH ----- 61 MPH
2. 1.93 = 68 MPH ---- 72 MPH ----- 78 MPH
3. 1.53 = 86 MPH ---- 91 MPH ----- 96 MPH
4. 1.20 = 109 MPH --- 116 MPH --- 123 MPH


I am behind you with this and ready to make it happen.

- K20 makes average more power/tq
- K20 has much shorter gears

Why not make gears much shorter than you offered... shorter gears is same action like upping the power. If we more more power, we need to put the power to the ground anyway... so getting better tires and shorter gears is way to go.

We are not making these for 2L VE motors.


These are for 2.3L - 2.4L motors.

Most guys who have K24s making 280 - 300 WHP go with the 5 speed box which has longer gears than the 6 speed short ratio box.

You need to understand that the three intreated parties in these gear boxes drive their cars on the street 98% of the time and 2% of the time at the track.

Getting the car to move forward on drag radials and trying to control wheels spin in 1st and 2nd gear is the only priority here.

You also need to know that the gears boxes listed are shorter where it counts and longer where it needs to be.

SER below to compare

SR20DE Gear Box, FD 4.176 on 23 tires at 8000 RPMs

1. 3.063 = 44 MPH
2. 1.826 = 72 MPH
3. 1.286 = 102 MPH
4. 0.975 = 134 MPH
5. 0.756 = 173 MPH

Remember Jamie they can be fine tuned with the 4.176, 4.4 or 4.7 FD.

I like the one below, using the most popular FD 4.176 and 4.4.

Seems to me the 4.4 FD is the best setup for 2L and 2.3L when looking at MPH.

4.176 FD 23 tires at 8000 - 8500 RPMs

1. 2.40 = 55 MPH ---- 58 MPH
2. 1.65 = 79 MPH ---- 84 MPH
3. 1.32 = 99 MPH ---- 106 MPH
4. 1.15 = 114 MPH --- 121 MPH

4.4 FD 23 tires at 8000 - 8500 RPMs

1. 2.40 = 52 MPH ---- 55 MPH
2. 1.65 = 75 MPH ---- 80 MPH
3. 1.32 = 94 MPH ---- 100 MPH
4. 1.15 = 108 MPH --- 115 MPH

4.7 FD 23 tires at 8000 - 8500 RPMs

1. 2.40 = 49 MPH ---- 52 MPH
2. 1.65 = 71 MPH ---- 75 MPH
3. 1.32 = 88 MPH ---- 94MPH
4. 1.15 = 101 MPH --- 108 MPH

It looks good. Even for the 220whp 2 liter and 4.7 fd should work well.


The main problem we have with our tranys is way to long of 4th gear. With this par box that problem is solved, and improved even further from a closer spread and less rpm drop.

I'm personally very happy with my ser box and 4.7fd since the only street races I do are on the highway. I would like to see how the longer 1st gear would perform at the track with a full slick though. It should really help the short times for sure. And I'm already hitting low 1.6 60fts.

How much would these boxes cost before fd.?

I have to agree with this one.
4.176 FD 23 tires at 8000 - 8500 RPMs

1. 2.40 = 55 MPH ---- 58 MPH
2. 1.65 = 79 MPH ---- 84 MPH
3. 1.32 = 99 MPH ---- 106 MPH
4. 1.15 = 114 MPH --- 121 MPH

This seems to be a better option than the one I stated earlier.

We can all agree first gear is too short. 11mph longer first seems ideal while having 2nd on par with the STD SE-R gearbox with a shorter 1-2 spacing.

3rd-4th spacing seems ideal. 8mph spread vs 33mph on the STD SE-R box.

I am doing this for the VVL guys. I am not making any money. Here is the quote I got not including shipping.


For the 1st~4th synchromesh engagement straight kit, the price will be $2,840 AUD for a single set.

If you order 3 sets together, you'll get a 15% discount.


Regards,

Gerard Chan

Guys remember these will be straight cut gears 1st-4th. This means more HP will be put down to the ground.

You will have to buy your own 5th gear which will be from the factory for highway use and less noise.

There are 3 choices that can be had from Nissan.

SER 91-98 = 0.756
G20T 91-99 = 0.733
SR18DE from G Spec ( must be ordered ) = 0.810